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Metals 2018, 8(4), 254; https://doi.org/10.3390/met8040254

Abnormal Grain Growth in the Heat Affected Zone of Friction Stir Welded Joint of 32Mn-7Cr-1Mo-0.3N Steel during Post-Weld Heat Treatment

1,2
,
1,* , 1
,
2
and
3
1
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2
College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
3
State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150000, China
*
Author to whom correspondence should be addressed.
Received: 12 March 2018 / Revised: 3 April 2018 / Accepted: 5 April 2018 / Published: 9 April 2018
(This article belongs to the Special Issue Friction Stir Welding and Processing in Alloy Manufacturing)
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Abstract

The abnormal grain growth in the heat affected zone of the friction stir welded joint of 32Mn-7Cr-1Mo-0.3N steel after post-weld heat treatment was confirmed by physical simulation experiments. The microstructural stability of the heat affected zone can be weakened by the welding thermal cycle. It was speculated to be due to the variation of the non-equilibrium segregation state of solute atoms at the grain boundaries. In addition, the pressure stress in the welding process can promote abnormal grain growth in the post-weld heat treatment. View Full-Text
Keywords: friction stir welding; abnormal grain growth; high nitrogen steel; post-weld heat treatment; non-equilibrium segregation friction stir welding; abnormal grain growth; high nitrogen steel; post-weld heat treatment; non-equilibrium segregation
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Li, Y.; Fu, R.; Li, Y.; Peng, Y.; Liu, H. Abnormal Grain Growth in the Heat Affected Zone of Friction Stir Welded Joint of 32Mn-7Cr-1Mo-0.3N Steel during Post-Weld Heat Treatment. Metals 2018, 8, 254.

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