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최철영; 김준기; 홍재근; 염종택; 박영도

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자료유형: 학술저널

저자정보: 최철영 김준기 홍재근 염종택 박영도

저널정보: 한국분말야금학회 한국분말야금학회지 한국분말야금학회지 제18권 제1호

발행연도: 2011.1

수록면: 64 - 72 (9page)

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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.

#Iinstrumented indentation test #High strength steels #Resistance spot weld #Mechanical properties

참고문헌 (11)

참고문헌 신청

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D. J. Radakovic / 2008 / / American Welding Journal 87 : 96 ~

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I. C. Noyan / 1987 / Residual Stresses 1 / Springer-VERLAG : 276 ~