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The Effect of Grain Size on Corrosion Fatigue of A537 Steel

Published online by Cambridge University Press:  15 February 2011

Qing Wang  and
Yu-Jiu Song
Qing Wang
Affiliation:
Dept. of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300
Yu-Jiu Song
Affiliation:
Dept. of Materials Science & Engineering, Xi'an Jiaotong University, Xi'an, China
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Abstract

The influence of grain size on corrosion fatigue behavior of A537 steel in 0.1M HCL solution has been studied. The results show that the increase of grain size can improve the corrosion fatigue crack growth resistance. But the change of crack growth rate da/dN with average grain diameter D is not monotonic. When D>40 μm, crack propagates little faster when grain is larger. When D>40 μm, crack propagates slower when grain is larger. According to the fractographic features, corrosion fatigue mechanism is anodic dissolution under fine grain condition but hydrogen embrittlement under coarse grain condition.

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