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MICROFRACTOGRAPHY OF NEAR-THRESHOLD FATIGUE CRACK PROPAGATION IN DUAL PHASE STEELS |
ZHENG Yesha;WANG Zhongguang;AI Suhua State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Academia Sinica; Shenyang |
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Cite this article:
ZHENG Yesha;WANG Zhongguang;AI Suhua State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Academia Sinica; Shenyang. MICROFRACTOGRAPHY OF NEAR-THRESHOLD FATIGUE CRACK PROPAGATION IN DUAL PHASE STEELS. Acta Metall Sin, 1992, 28(4): 34-39.
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Abstract SEM microfractographic observations on fatigue crack propagation in thenear-threshold region were carried out 3 morphologies of morphologies of martensite and 6 du-al phase steels containing martensite. All of them are featured by cyclic cleavage facets, i. e.,mainly controlled by action of stress type Ⅱ. In the higher △K regions, the fracture surfaces arecharacterized by mixed modes including cyclic cleavage facets, two types of secondary cracksand striations. The roughness-induced crack closures of fracture surface is attributed primarilyto extreme high fatigue threshold value.
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Received: 18 April 1992
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