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Materials Science and Technology Volume 30, 2014 - Issue 10
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Research Paper

Effect of grain boundary behaviour on ductility dip cracking mechanism

J. Q. ChenSchool of Materials Science and EngineeringShanghai Jiao Tong University, Shanghai, 200240, China
,
H. LuSchool of Materials Science and EngineeringShanghai Jiao Tong University, Shanghai, 200240, China;Shanghai Key Laboratory of Materials Laser Processing and ModificationShanghai Jiao Tong University, Shanghai, 200240,ChinaCorrespondence[email protected]
,
W. CuiSchool of Materials Science and EngineeringShanghai Jiao Tong University, Shanghai, 200240, China
,
J. M. ChenSchool of Materials Science and EngineeringShanghai Jiao Tong University, Shanghai, 200240, China
&
Y. F. HuangShanghai Key Laboratory of Materials Laser Processing and ModificationShanghai Jiao Tong University, Shanghai, 200240,China;Shanghai Nuclear Engineering Research & Design InstituteShanghai200233, China
Pages 1189-1196 | Received 04 Aug 2013, Accepted 08 Oct 2013, Published online: 06 Dec 2013
 
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Abstract

Alloy 690 is a typical Ni–Cr–Fe alloy widely used in nuclear power application. However, the companion welding filler metal 52M (FM-52M) is susceptible to an intergranular hot cracking referred to as ductility dip cracking (DDC). To investigate the effect of grain boundary (GB) characteristics on cracking mechanism of FM-52M, the extent of GB sliding and cracking was recorded based on strain-to-fracture test. By the results, it was concluded that the strength of GBs mainly affected the cracking resistance, which could be improved by increase of intergranular precipitates. During hot tensile, GB sliding was observed inducing DDC in mainly two ways: initiate cracking where GB sliding was inhibited by inflexion or triple point, and assist in developing microcrack by skipping hard propagation part of GB. Moreover, cracking was found to have a clear relation to GB misorientation. The results gave an understanding of GB sliding to DDC mechanism.

Acknowledgement

The present work is supported by the National Natural Science Foundation of China (no.51035004, no.51105251 and no. 51204107).

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