FATIGUE CRACK DEFLECTION AND FORMATION OF MICROCRACKS IN POROSITY AREA OF ZG42CrMo

Acta Metall Sin

1996, Vol. 32

Issue (10): 1056-1062 DOI:

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FATIGUE CRACK DEFLECTION AND FORMATION OF MICROCRACKS IN POROSITY AREA OF ZG42CrMo

ZHAO Fangxin;ZHANG Yingjie;ZHANG Song;ZHAO Zuxin;YIN Shaokui;LI Decheng(Shenyang Research Institute of Foundry;Ministry of Machine Building Industries;Shenyang 110021)(Shenyang Polytechnic University;Shenyang 110023)(Northeastern University;Shenyang 110006)(Shenyang Research Institute of Foundry;Ministry of Machine Building Industries;Shenyang 110021)(Manuscript received 1996-02-05;in revised form 1996-05-06)

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Abstract The fatigue crack propagation rates of ZG42CrMo and its porosity area were measured.The process of fatigue crack growth in porosity area was observed by using metallographic tracing method.Dislocation and slip at the tip of fatigue crack have been studied by using TEM.The morphologies of porosities and microcracks together with sulphide on the surface of porosities were researched by using EPM.Two effects of porosities which make crack deflection and catch crack on fatigue crack growth have been discussed.Possible mechanism of microcrack initiation has been analysed.

Key words: ZG42CrMo porosity fatigue crack deflection microcrack.

Received: 18 October 1996

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