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
Determination of the Strain-Hardening Exponent of a Metallic Material by Low-Speed Impact Indentation
A. P. Kren,V. A. Rudnitskii +1 more
TL;DR: In this paper, the authors used dynamic indentation data with allowance for loading conditions, namely, the energy before an impact and the indenter parameters, to determine strain-hardening exponent n. n is found to depend on the strain and the strain rate.
Journal ArticleDOI
Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels
TL;DR: The development of advanced high-strength bainitic steels has been preceded and linked to different metallurgical advances, both in the field of fundamental materials science and in technological fields closer to the production and final application as discussed by the authors .
Proceedings ArticleDOI
Revealing properties of structural materials by combining regression-based algorithms and nano indentation measurements
TL;DR: This work proposes a framework, which applies a state-of-the-art big data processing technique implementing a predictive function between characteristic values (determined on micro level) and material properties on macro level, implemented by orchestrating a kernelbased recursive least-squares algorithm.
Journal ArticleDOI
Gradient plasticity in gradient nanocrystalline metals: Extra toughness from dislocation migration
TL;DR: In this paper, a tensile analysis of gradient nanocrystalline (GNC) copper was performed using tensile tests and it was found that the reduction in strain-hardening capacity is positive related to the depression in strain localization.
Journal ArticleDOI
Microstructure, mechanical properties and strengthening mechanisms of friction stir welded Kanthal APMT™ steel
TL;DR: In this article, friction stir welding (FSW) was applied to a Kanthal APMT™ plate in a bead-on-plate configuration using a tool rotation rate of 600 RPM and a traverse speed of 25.4 mm/min.
References
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Book
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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