Journal ArticleDOI
Correlation of Yield Strength and Tensile Strength with Hardness for Steels
Erik J. Pavlina,C.J. Van Tyne +1 more
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In this paper, the authors used regression analysis to determine the correlation of the yield strength and the tensile strength to the diamond pyramid hardness values for over 150 nonaustenitic, hypoeutectoid steels.Abstract:
Hardness values as well as yield and tensile strength values were compiled for over 150 nonaustenitic, hypoeutectoid steels having a wide range of compositions and a variety of microstructures. The microstructures include ferrite, pearlite, martensite, bainite, and complex multiphase structures. The yield strength of the steels ranged from approximately 300 MPa to over 1700 MPa. Tensile strength varied over the range of 450-2350 MPa. Regression analysis was used to determine the correlation of the yield strength and the tensile strength to the diamond pyramid hardness values for these steels. Both the yield strength and tensile strength of the steels exhibited a linear correlation with the hardness over the entire range of strength values. Empirical relationships are provided that enable the estimation of strength from a bulk hardness measurement. A weak effect of strain-hardening potential on the hardness-yield strength relationship was also observed.read more
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Journal ArticleDOI
Investigation of the electroplastic effect using nanoindentation
Doreen Andre,T. Burlet,F. Körkemeyer,Gregory Gerstein,James S.K.-L. Gibson,Stefanie Sandlöbes-Haut,Sandra Korte-Kerzel +6 more
TL;DR: In this paper, the electroplastic effect during nanoindentation on individual phases and well-defined interfaces was developed using a eutectic Al-Al2Cu alloy as a model material, and the results of the micro- and macroscopic investigations reveal current induced displacement shifts and stress drops, respectively, with the first displacement shift/stress drop being higher than the subsequent ones.
Journal ArticleDOI
Quasi-static and dynamic testing of splitting, expansion and expansion-splitting hybrid tubes under oblique loading
TL;DR: In this paper, a methodology of assessing the oblique loading performance of "flat-toped" energy absorbers is presented to compare the performance of the splitting, expansion and the novel expansion-splitting tubes.
Journal ArticleDOI
Predicting the hardness profile across resistance spot welds in martensitic steels
TL;DR: In this article, a simple three-step method was proposed to predict the hardness profile of resistance spot welds using a neural network model, where the temperature history throughout the weld zone is calculated and known models describing the local phase transformations that occur during welding are applied.
Journal ArticleDOI
Calculation of gear tooth flank surface wear during an FZG micropitting test
TL;DR: In this article, a numerical simulation of the wear sustained by the surface of an FZG pinion during a gear micropitting test was performed, and a mixed lubrication model was used to take into account both surface roughness and lubricant properties, as well as a wear model based on Archard's wear equation.
Journal ArticleDOI
Microstructural characterisation of rolling contact fatigue damage in flashbutt welds
TL;DR: In this paper, a detailed microstructural examination of the characteristics associated with flashbutt welds in the new condition and after exposure to service conditions which resulted in gauge corner cracking has been performed in order to correlate the development of rolling contact fatigue damage to the underlying microstructure.
References
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The Science of hardness testing and its research applications : based on papers presented at a symposium of the American Society for Metals, October 18 to 20, 1971
J. H. Westbrook,Hans Conrad +1 more
The determination of yield strength from hardness measurements
TL;DR: In this paper, it was shown that the 0.2 pct offset yield strength of a material can be obtained from simple hardness measurements using the expression σ y = (H/3)(0.1) m-2cffff, where H is the Diamond pyramid hardness and m is Meyer's hardness coefficient.
Journal ArticleDOI
Microhardness mapping and the hardness-yield strength relationship in high-pressure diecast magnesium alloy AZ91
Carlos H. Cáceres,J.R. Griffiths,J.R. Griffiths,Amirreza Pakdel,Cameron Davidson,Cameron Davidson +5 more
TL;DR: In this article, microhardness maps of cross-sections of high pressure diecast test bars of AZ91 have been determined, and the mean hardness obtained by integrating the micro hardness maps over the entire cross-section increased with decreasing thickness of the bars, and was found to be in good correlation with each bar's yield strength.
Journal ArticleDOI
On the correlation of mechanical and physical properties of 7075-T6 Al alloy
R. Clark,B. Coughran,I. Traina,A. Hernandez,T. Scheck,C. Etuk,J. Peters,E.W. Lee,J. Ogren,Omar S. Es-Said +9 more
TL;DR: In this paper, the influence of varying the thermal processing parameters on the physical and mechanical properties of 7075 T6 aluminum alloy was studied and an excellent correlation was found between the tensile strength and hardness.
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