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IN SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL |
YAO Kefu;TANG Naiyong;CHEN Nanping Tsinghua University |
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Cite this article:
YAO Kefu;TANG Naiyong;CHEN Nanping Tsinghua University. IN SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL. Acta Metall Sin, 1989, 25(3): 57-62.
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Abstract In the ferrite grains, the dislocation emitted by the crack tips maycross-slip out of the original slip planes and form a broad plastic zone. However, inaustenite, the dislocation free zone is small and the dislocations emittee by the crackpile-up in its slip plane. The selection of the slip planes at the crack tip depend onthe Schmid factor of crack tip in both phases. But after large deformation, the se-lection of the second slip systems at the crack tip in austenite does not depend on theSchmid factor.
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Received: 18 March 1989
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1 Rice J R, Rosengren G F. J Mech Phys Solids, 1968; 16: 1 2 Hutchinson J W. J Mech Phys Solids, 1968; 16: 13 3 Gardner R N, Wilsdoif H G F. Metall Trans, 1980; 11A: 653 4 Ohr S M. Mater Sci Eng, 1985; 72: 1 5 张以增,戴蜀娟,邹鸿承,苗丕峰,理化检验(物理分册),1985;22(5) :19 6 姚可夫,唐迺泳,陈南平.第五届全国断裂力学会议文集,桂林,1988:156 |
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