TEM OBSERVATION ON LOCAL DEFORMATION BAND AHEAD OF CRACK TIP

Acta Metall Sin

1991, Vol. 27

Issue (6): 1-8 DOI:

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TEM OBSERVATION ON LOCAL DEFORMATION BAND AHEAD OF CRACK TIP

YAO Kefu University of Science and Technology Beijing; TANG Naiyong; CHEN Nanping Tsinghua University; Beijing

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YAO Kefu University of Science and Technology Beijing; TANG Naiyong; CHEN Nanping Tsinghua University; Beijing. TEM OBSERVATION ON LOCAL DEFORMATION BAND AHEAD OF CRACK TIP. Acta Metall Sin, 1991, 27(6): 1-8.

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Abstract The local deformation bands formed ahead of crack tip both in ferrite and in austenite were in situ observed under TEM during deformation process of a ferrite-austenite duplex stainless steel. It is dominated by crack tip Schmid factors, dislocation shielding latent hardening and hardening coefficient. If the crack tip slip system was preferably activated by pure mode Ⅱ resolute and the decreasing rate of hardening coefficient was enough, then the local deformation band ahead of crack tip was easy to be formed.

Key words: crack tip local deformation band dislocation shielding

Received: 18 June 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I6/1

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