The microstructure characteristic, fatigue damage behaviours and evolution of microstructure during the fatigue testing of 2060 Al-Li alloy thin plate were studied by fatigue
Superaustenitic stainless steels:the microstructure and fatigue strength of welded joints A Comparison of Fatigue Properties of Austempered Jan 04, 2011 · similar fatigue limit to the quenched and tempered steel. Other investigators have found that austempered steels have higher fatigue strength (Ref 7), lower fatigue crack propagation rates (Ref 7-9), and lower fatigue threshold stress intensity (Ref 9) than martensitic steels in 0.45C-1.5Cr-1.5Si-0.1V
Bearing, which made the fatigue strength of the fillet region of the groove decrease. The stress concentration at fillet area initializes the fatigue. The chemical composition of the failed main-shaft material was determined by spectroscopy chemical Analysis method. The microstructure in various regions was observed by SEM. A cost-effective optimization approach for improving the Jan 03, 2021 · Diamond burnishing is a surface modification method aimed at improvements in the surface integrity (SI) and operating behavior of metal components. A cost-effective optimization approach for increasing the fatigue strength of diamond-burnished steel components has been developed. The basic idea is that the fatigue strength can be
Contact fatigue produces a surface damage that is unique and well recognized. Familiar examples are found in fatigue of ball and roller bearings. A typical failure in a roller bearing is shown in Fig. 1. Although this spall is small, it would grow in size until roller fracture would occur, as bearing operation continues. Effect of HIP Treatment on Microstructure and Fatigue microstructure, as well as the corresponding fatigue strength of selectively-laser-melted (SLM) AlSi10Mg structures. To eliminate the inuence of the as-built surface, all specimens are machined and exhibit a polished surface. To highlight the effect of the HIP treatment, the HIP specimens are compared to a test series without any post-treatment.
structure on fatigue strength. The microstructure of the hot-dip galvanized layer consists of a lamination structure in which there are a plurality of alloy layers and a pure zinc layer. Since the mechanical properties and crystal structures of their phases are different with each other,1315) Effect of Post Treatment on the Microstructure, Surface This paper focusses on the effect of hot isostatic pressing (HIP) and a solution annealing post treatment on the fatigue strength of selectively laser melted (SLM) AlSi10Mg structures. The aim of this work is to assess the effect of the unprocessed (as-built) surface and residual stresses, regarding the fatigue behaviour for each condition. The surface roughness of unprocessed
- AbstractIntroductionExperimental ProcedureResults and DiscussionConclusionsAcknowledgmentsFully reversed bending fatigue tests were performed on polished hour-glass specimens of commercially pure titanium grade 1 with three different grain sizes, that were produced by severe plastic deformation (rotary swaging) and subheat treatments, in order to examine the effect of grain size on fatigue. An improvement in fatigue strength was observed, as the polycrystal grain size was refined. The endurance limit stress was shown to depend on the inverse square root oInfluence of High Strength Steel Microstructure on The Microstructure of high strength steel and it correlation to fatigue crack propagation are complex, diverse and can be changed by composition, heat treatment conditions and homogeneousness . The microstructure influence on fatigue crack propagation or growth rate of steel still have contradictory literatures
Fatigue strength and microstructural features of spring fatigue strength notch effect microstructure . Abstract . Knowledge about the local dynamic properties of steel, as well as the local loading conditions is absolutely neces-sary for the fatigue analysis and life time prediction of spring steel components. Mono-leaf and double-leaf springs of specific geometry made of 51CrV4 spring steel
The fatigue behavior of Al-Si-Mg casting alloys is affected by the solidification microstructure and especially by defects such as gas pores, shrinkage pores and oxide films. This paper reports the microstructural characterization of a die cast engine head made of the A356 (G-AlSi7Mg0.3) alloy and the long-life fatigue strength determination MICROSTRUCTURE, STRENGTH AND FATIGUE OF AN structure parameters which lead to an enhancement of the strength and fatigue properties in Al alloys is an important task. As shown in [20-25] the grain refinement in Al alloys does not always lead to increase of fatigue. At the present time, two approaches for increasing the fatigue of UFG materials are proposed.
May 18, 2018 · Rolling contact fatigue is the main failure mechanism of tapered roller bearings. This study investigated the fatigue mechanism of rollers in a tapered roller bearing that failed in a run-to-failure test. Roller microstructure and crack morphology were investigated through scanning electron microscopy. A microhardness test was performed to investigate the strain hardening of the roller Metallurgical Failure Analysis and Improved Core Hardness Jun 03, 2020 · In the ISO 606 standard, the fatigue strength of ANSI 80H simplex roller chain is reported as minimum 10.7 kN. The maximum test force F max is determined by using the Johnson Goodman relationship according to the ISO 15654 standard.
Jun 14, 2000 · Microstructure and HighTemperature Strength of Monocrystalline NickelBase Superalloys. H. Mughrabi. Search for more papers by this author. U. Tetzlaff. ects of Di erent Roller Proles on the Microstructure and After bonding, the microstructure in a typical case (i.e., No. 1) was captured by scanning electron microscopy (SEM) to examine the formation of the welding joints. Additionally, the load and the peel strength of the welding joints of all eight roller
austempered microstructure.2141) The fatigue strength of ADI was superior to those of ferritic, pearlitic and quenched and tempered grades.21,3437) The literature on fatigue prop-erties of ADI presents that the chemical composition, auste-nization and austempering temperatures are important parameters to control of the fatigue strength of ADI.2141)