- Evaluation of Mechanical Properties by Using Instrumented Indentation Testing for Resistance Spot Welds
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Chul-Young Choi, Jun-Ki Kim, Jae-Keun Hong, Jong-Taek Yeom, Yeong-Do Park
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J Korean Powder Metall Inst. 2011;18(1):64-72.
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DOI: https://doi.org/10.4150/KPMI.2011.18.1.064
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- Nondestructive instrumented indentation test is the method to evaluate the mechanical properties by analyzing load - displacement curve when forming indentation on the surface of the specimen within hundreds of micro-indentation depth. Resistance spot welded samples are known to difficult to measure the local mechanical properties due to the combination of microstructural changes with heat input. Particularly, more difficulties arise to evaluate local mechanical properties of resistance spot welds because of having narrow HAZ, as well as dramatic changed in microstructure and hardness properties across the welds. In this study, evaluation of the local mechanical properties of resistance spot welds was carried out using the characterization of Instrumented Indentation testing. Resistance spot welding were performed for 590MPa DP (Dual Phase) steels and 780MPa TRIP (Transformation Induced Plasticity) steels following ISO 18278-2 condition. Mechanical properties of base metal using tensile test and Instrumented Indentation test showed similar results. Also it is possible to measure local mechanical properties of the center of fusion zone, edge of fusion zone, HAZ and base metal regions by using instrumented indentation test. Therefore, measurement of local mechanical properties using instrumented indentation test is efficient, reliable and relatively simple technique to evaluate the tensile strength, yield strength and hardening exponent.
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Citations
Citations to this article as recorded by  - Vacuum brazing of dissimilar tubular component of AA2219 and AISI 304 by a low melting Al-18Ag-20Cu-5Si-0.2Zn braze alloy
Srinivas V., Amit Kumar Singh, Gopala Krishna V., Madhusudhan Reddy G.
Journal of Materials Processing Technology.2018; 252: 1. CrossRef
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