TEM OBSERVATION OF LOCAL DEFORMATION BAND AT CRACK TIP

Acta Metallurgica Sinica (English Letters) ›› 1992, Vol. 5 ›› Issue (3): 147-153.

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TEM OBSERVATION OF LOCAL DEFORMATION BAND AT CRACK TIP

YAO Kefu University of Science and Technology Beijing,Beijing,ChinaTANG Naivong CHEN Nanping Tsinghua University,Beijing,China

Received:1992-06-25 Revised:1992-06-25 Online:1992-06-25 Published:2009-10-10

Abstract

Abstract: The thin foil specimen of a ferrite-austenite duplex stainless steel was tensiled under transmis- sion electron microscope(TEM).It was found that both in ferrite and austenite the local deformation band at crack tip was formed near to the crack propagating direction.Its forma- tion was related with the crack tip Schmid factor,dislocation shielding,latent hardening and hardening coefficient.When the crack tip emitted dislocations to a slip system by the action of pure mode Ⅱ stress resolute,and the decreasing rate of hardening coefficient was suitable,lo- cal deformation band was easy to form.

Key words: crack tip, local deformation band, dislocation shielding

YAO Kefu University of Science and Technology Beijing,Beijing,ChinaTANG Naivong CHEN Nanping Tsinghua University,Beijing,China. TEM OBSERVATION OF LOCAL DEFORMATION BAND AT CRACK TIP[J]. Acta Metallurgica Sinica (English Letters), 1992, 5(3): 147-153.

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[3]	WEI Xuejun ZHOU Xiangyang LI Jin LIU Guanglei KE Wei Corrosion Science Laboratory,Academia Sinica,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,China Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China. AN APPLICATION OF SPI TECHNIQUE FOR STUDING STRA DISTRIBUTION AT CRACK TIP [J]. Acta Metallurgica Sinica (English Letters), 1993, 6(12): 453-458.
[4]	CHEN Zheng Northwestern Polytechnical University,Xi′an,China Lab.No.401,Northwestern Polytechnical University,Xi′an 710072. THRESHOLD OF SHORT FATIGUE CRACK FOR Al-Li ALLOY 8090 [J]. Acta Metallurgica Sinica (English Letters), 1991, 4(2): 135-138.
[5]	LI Qingsheng;(Chingshen Li)Taiyuan University of Technology,Taiyuan,China T.BRETHEAU Laboratory PMTM,CNRS,University Paris Nord Dept.of Mathematics and Mechanics,Taiyuan University of Technology,Taiyuan 030024,China. EFFECT OF GRAIN BOUNDARY ON FATIGUE BEHAVIOUR OF Al BICRYSTALS [J]. Acta Metallurgica Sinica (English Letters), 1990, 3(6): 429-434.
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TEM OBSERVATION OF LOCAL DEFORMATION BAND AT CRACK TIP

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