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Microstructural Effects On The Fatigue Behavior Of Fe C X Alloys
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Book Synopsis Microstructural Effects on the Fatigue Behavior of Fe-C-X Alloys. Final Report by :
Download or read book Microstructural Effects on the Fatigue Behavior of Fe-C-X Alloys. Final Report written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective was to study dual phase steels. Macroscopic effects of reversing the continuous phase from ferrite to martensite was examined. The next section looks at the role of carbide distribution and morphology precipitated within ferrite during thermal cycling. Finally, finite element modeling is used to assist in understanding the experimental results.
Book Synopsis Microstructural effects on the fatigue behavior of fe-c-x alloys by : Gary J. Shiflet
Download or read book Microstructural effects on the fatigue behavior of fe-c-x alloys written by Gary J. Shiflet and published by . This book was released on 1986 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructural Effects on the Fatigue Behavior of Fe-C-X Alloys. [Dual-phase Steels]. by :
Download or read book Microstructural Effects on the Fatigue Behavior of Fe-C-X Alloys. [Dual-phase Steels]. written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective was to study dual phase steels. Macroscopic effects of reversing the continuous phase from ferrite to martensite was examined. The next section looks at the role of carbide distribution and morphology precipitated within ferrite during thermal cycling. Finally, finite element modeling is used to assist in understanding the experimental results.
Book Synopsis The effect of microstructure on the fatigue behavior of fe-c-x alloys by : Gary J. Shiflet
Download or read book The effect of microstructure on the fatigue behavior of fe-c-x alloys written by Gary J. Shiflet and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructural Effects in the Fatigue Behavior of Metals and Alloys by : Norman S. Stoloff
Download or read book Microstructural Effects in the Fatigue Behavior of Metals and Alloys written by Norman S. Stoloff and published by . This book was released on 1974 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review examines the various stages of fatigue damage on the basis of changes in slip character and dislocation sub-structures resulting from solid solution alloying, thermomechanical treatments or precipitation hardening. Cyclic hardening and softening are related to fatigue life of a wide variety of alloy systems, including pure metals, commercial alloys, intermetallic compounds and directionally solidified eutectics. The influence on fatigue behavior of variations in structure produced by processing (e.g., casting defects, inclusions, surface notches) also are considered. Finally, the effects of temperature and aggressive environments on crack nucleation and propagation are related to metallurgical structure.
Book Synopsis Effect of Microstructures on Low Cycle Fatigue Behavior in a TC6 (Ti-6AI-2.5Mo-2Cr-0.5Fe-0.3Si) Titanium Alloy by : Zhang SQ
Download or read book Effect of Microstructures on Low Cycle Fatigue Behavior in a TC6 (Ti-6AI-2.5Mo-2Cr-0.5Fe-0.3Si) Titanium Alloy written by Zhang SQ and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an investigation on the low cycle fatigue (LCF) behavior, at room temperature and 400°C for four conventional microstructures (Widmannstatten, basket-weave, equiaxed, and duplex) in a TC6 titanium alloy are presented. The fatigue crack nucleation and propagation in fatigue-tested specimens have been observed by scanning electron microscopy (SEM). The duplex microstructure is associated with the longest LCF life at room temperature and 400°C, while the Widmannstatten microstructure has the shortest. The crack initiation sites and propagation paths were examined and discussed. The cracks primarily initiated along slip bands on the specimen surface for all four microstructures. In addition, many voids appeared along slip bands for the equiaxed microstructure. By linking-up these voids, the formation of microcracks is realized. The propagation of interior cracks in specimens with Widmannstatten structure proceeded by cross-cutting W? platelets by way of a plastic blunting mechanism, whereas for the equiaxed microstructure interior cracks grew by the linking-up of voids by way of a renucleation mechanism.
Book Synopsis Microstructural Effects on the Fatigue Properties of a Cast A17SiMg Alloy by : A. Wickberg
Download or read book Microstructural Effects on the Fatigue Properties of a Cast A17SiMg Alloy written by A. Wickberg and published by . This book was released on 1984 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Fatigue of Metals by : José A.F.O. Correia
Download or read book Mechanical Fatigue of Metals written by José A.F.O. Correia and published by Springer. This book was released on 2019-05-07 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the XIX International Colloquium on Mechanical Fatigue of Metals, held at the Faculty of Engineering of the University of Porto, Portugal, 5-7 September 2018. This International Colloquium facilitated and encouraged the exchange of knowledge and experiences among the different communities involved in both basic and applied research in the field of the fatigue of metals, looking at the problem of fatigue exploring analytical and numerical simulative approaches. Fatigue damage represents one of the most important types of damage to which structural materials are subjected in normal industrial services that can finally result in a sudden and unexpected abrupt fracture. Since metal alloys are still today the most used materials in designing the majority of components and structures able to carry the highest service loads, the study of the different aspects of metals fatigue attracts permanent attention of scientists, engineers and designers.
Book Synopsis Linking Enhanced Fatigue Life to Design by Modifying the Microstructure by : Kaimiao Liu
Download or read book Linking Enhanced Fatigue Life to Design by Modifying the Microstructure written by Kaimiao Liu and published by . This book was released on 2019 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural material fatigue is a leading cause of failure and has motivated fatigue-resistant design to eliminate risks to human lives. Intrinsic microstructural features alter fatigue deformation mechanisms so profoundly that, essentially, fatigue properties of structural materials become deviant. With this in mind, we initiated this project to investigate the microstructural effect on fatigue behavior of potential structural high entropy alloys. With a better understanding of the effect of microstructure features on fatigue properties, the ultimate goal was to engineer the microstructure to enhance the fatigue life of structural materials. The effects of two major deformation mechanisms presented here are twinning-induced fatigue crack retardation, and transformation-induced fatigue crack retardation. The fundamental principle of both mechanisms is to delay the fatigue crack propagation rate by altering the work hardening ability locally within the crack plastic zone. In ultrafine grained triplex Al0.3CoCrFeNi, nano-sized deformation twins were observed during cyclic loading in FCC matrix due to low stacking fault energy (SFE). The work-hardening ability of the material near the crack was sustained with the formation of twins according to Considere's criteria. Further, due to the ultrafine-grained (UFG) nature of the material, fatigue runout stress was enhanced. In a coarse-grained, dual-phase high entropy alloy, persistent slip bands formed in FCC matrix during cyclic loading due mainly to the slight composition change that affects the SFE in the FCC matrix and eventually alters the deformation mechanism. Another way known to alter an alloy's work hardening (WH) ability is transformation-induced plasticity (TRIP). In some alloys, phase transformation happens due to strain localization, which alters the work-hardening ability. iii In a fine-grained, dual-phase metastable high entropy alloy, gamma (f.c.c.) to epsilon (h.c.p.) transformation occurred in the plastic zone that was induced from cracks. Thus, we designed a Cu-containing FeMnCoCrSi high entropy alloy that exhibited a normalized fatigue ratio of ̃ 0.62 UTS (ultimate tensile strength). Our design approach was based on (a) engineering the gamma phase stability to attain sustained work hardening through delayed gamma (f.c.c.) to epsilon (h.c.p.) transformation to hinder fatigue crack propagation, (b) incorporating an ultrafine-grained microstructure to delay crack initiation, and (c) forming deformation twins to reduce the crack propagation rate. We verified that a UFG gamma dominant microstructure could provide opportunities for exceptional fatigue resistance, as sustained WH activity strengthened the material locally in the crack plastic zone, thereby validating our expectation that the combination of UFG and TRIP is a path to design the next generation of fatigue-resistant alloys.
Book Synopsis Advances in Understanding the Fatigue Behavior of Materials by : Tirumalai S. Srivatsan
Download or read book Advances in Understanding the Fatigue Behavior of Materials written by Tirumalai S. Srivatsan and published by Trans Tech Publications Ltd. This book was released on 2008-03-07 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This special-topic book consists of a collection of technical papers assembled under the rubric of Advances in Understanding the Fatigue Behavior of Materials. The focus of Fatigue Behavior of Materials centers on the changes in properties that occur upon applying cyclic loads. Following its recognition and increasing importance during the latter half of the nineteenth century, this branch of study has focused upon the study and rationalization of the engineering approaches that are commonly used to design against the initiation and/or propagation of the fatigue damage which would otherwise culminate in catastrophic failure.
Book Synopsis Fatigue Behavior of High-entropy Alloys by : Michael Alexander Hemphill
Download or read book Fatigue Behavior of High-entropy Alloys written by Michael Alexander Hemphill and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was performed on the Al9Co1.2 Cr18.2Cu18.2Fe18.2Ni18.2 [subscripts atomic percent] and Al--.5Cr22.5Fe35Mn20Ni15 high-entropy alloys (HEAs) in an attempt to study their fatigue behavior. The present investigation shows encouraging fatigue-resistance characteristics due to their high fatigue lives of various samples at relatively high stresses. The current results indicate that the fatigue behavior of HEAs compares favorably to many conventional alloys, such as steels, titanium alloys, and advanced bulk metallic glasses with a fatigue-endurance limit of the Al9Co18.2Cr18.2Cu18.2Fe18.2Ni18.2 HEAs between 540 and 945 MPa and a fatigue-endurance limit to ultimate tensile strength ratio between 0.402 and 0.703. The Al--.5Cr22.5Fe35Mn20Ni15 HEAs were found to have a fatigue-endurance limit between 540 and 630 MPa. Some unpredictability in the fatigue life of the samples was observed by scattering in the stress versus life plot. Weibull models were applied to predict the fatigue data and to characterize the variability seen in Al99Co18.2Cr18.2Cu18.2Fe18.2Ni18.2 HEAs. A Weibull mixture predictive model was used to separate the data into two, strong and weak, groups. This model predicts that at stress ranges above 858 MPa, the median time to failure of specimens in the strong group will be greater than 107 cycles. Large oxide particles were found on the tensile surfaces of both samples with microcracks forming at these sites. It was shown that these microstructural defects may have a significant effect on the fatigue behavior of HEAs. A comparison of the endurance limits and fatigue ratios of HEAs to conventional structural alloys shows that HEAs may outperform many conventional alloys under fatigue conditions. It is believed that a reduction in the number of defects introduced during fabrication and processing may result in a superior fatigue behavior, which exceeds that of conventional alloys.
Book Synopsis Microstructural Effects on the Room and Elevated Temperature Low Cycle Fatigue Behavior of Waspaloy by : Bradley A. Lerch
Download or read book Microstructural Effects on the Room and Elevated Temperature Low Cycle Fatigue Behavior of Waspaloy written by Bradley A. Lerch and published by . This book was released on 1982 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rapid Assessment of the Role of Microstructural Variability in the Fatigue Behavior of Structural Alloys Using Ultrasonic Fatigue by :
Download or read book Rapid Assessment of the Role of Microstructural Variability in the Fatigue Behavior of Structural Alloys Using Ultrasonic Fatigue written by and published by . This book was released on 2007 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic fatigue (20kHz) has been used to investigate the role of microstructural variability on fatigue life variability for very long fatigue lives, between 10(to the 7th power) and 10(to the 9th power) cycles, in structural aerospace materials. This AFOSR program has been augmented by support from DARPA (Dr. Leo Christodoulou) and a summary of the results from the combined support is described in this report. Four distinctly different structural alloys have been studied: (1) a particle reinforced aluminum alloy, 2009Al/15SiCp, where clustering of SiC particles and the presence of processing-related inclusions is expected to control fatigue life, (2) an alpha/beta titanium disk alloy, Ti-6Al-2Sn-4Zr-6Mo, that has been processed to have a fine, homogeneous, two-phase microstructure that is essentially free of inclusions or other defects; (3) a polycrystalline nickel-base disk alloy, Rene 88DT which has a small but finite number of large grains that influence fatigue crack initiation; and a single crystal nickel-base superalloy for blade applications, PWA 1484. In this program, an advanced ultrasonic fatigue system capable of fatigue testing aerospace materials at 20 kHz and at temperatures form ambient to 1000 degrees C has been developed. For the polycrystalline materials, the magnitude of fatigue life variability was observed to be strongly dependent on the microstructure-dependent crack initiation processes, which, in turn, were different for each material. For 2009Al/15SiCp, crack initiation occurred in almost all cases at 20-30 micrometers diameter inclusions. Less than half an order of magnitude variation in fatigue life at 10(to the 9th power) cycles was observed and is explained by the absence of a significant crack initiation lifetime.
Book Synopsis Effect of Alloying Mode on the Microstucture and Fatigue Behavior of Fe-Ni-Cu-Mo P/M Steels by : Dmitri Alexander Bohn
Download or read book Effect of Alloying Mode on the Microstucture and Fatigue Behavior of Fe-Ni-Cu-Mo P/M Steels written by Dmitri Alexander Bohn and published by . This book was released on 1997 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Damage written by Filippo Berto and published by MDPI. This book was released on 2018-07-02 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Fatigue Damage" that was published in Metals
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1961 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Microstructure on Fretting Fatigue Behavior of a Near-alpha Titanium Alloy by : T. Satoh
Download or read book Influence of Microstructure on Fretting Fatigue Behavior of a Near-alpha Titanium Alloy written by T. Satoh and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate the effect of microstructure on the fretting fatigue behavior of a near-? titanium alloy, fretting fatigue tests were carried out using DAT54, which is used in compressor blades and disks in aircraft gas turbine engines. Two kinds of microstructure in DAT54 were prepared using different solution heat treatment temperatures: one is the equiaxed ? + ? lath microstructure and the other is the transformed ? structure. The plain and fretting fatigue strengths for the equiaxed ? + ? lath microstructure are higher than for the transformed ? structure. Fretting reduced fatigue strengths by a factor of three for both materials. Sensitivity to microstructure in fretting fatigue is relatively low compared with plain fatigue. Shot peening improved fretting fatigue life, because of lower tangential force between the specimen and the contact pad and because of residual stress in compression induced by shot peening treatment.
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