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    ZHANG Qing-chun, ZHAO Hai-li, CHEN Qi-feng, WANG Ji-liang, JIANG Zhao-xi. THREAD STRIPPING ANALYSIS ON B7 STUD[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2008, 44(9): 521-523.
    Citation: ZHANG Qing-chun, ZHAO Hai-li, CHEN Qi-feng, WANG Ji-liang, JIANG Zhao-xi. THREAD STRIPPING ANALYSIS ON B7 STUD[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2008, 44(9): 521-523.
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    THREAD STRIPPING ANALYSIS ON B7 STUD

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      • Abstract
    • The microstructure,micro-penetration hardness and chemical composition of B7 stud which thread stripped and the same lot number raw material after drawing and tempering were analyzed by means of light microscope,rockwell apparatus,HX-100 micro-hardness tester and Baird DV-6 optical emission spectrometer. The result showed that some microstructure defects in raw material such as banded segregation and inclusion result in the B7 stud longitudinal cracking;the surface decarburization of the raw material made hypo-crack taken place,even the thread stripped.
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