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Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section

Published online by Cambridge University Press:  26 February 2018

Yifei Li
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Zhipeng Cai*
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; and Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China
Kejian Li
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Jiluan Pan
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Xia Liu
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; and Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
Lingen Sun
Affiliation:
Technology Development Department, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
Peng Wang
Affiliation:
Technology Development Department, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: caizhipeng92@outlook.com
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Abstract

Welding was successfully used in the fabrication of low pressure steam turbine rotors for nuclear power plants. In this paper, the local brittle zone of the welded joint in NiCrMoV steel with heavy section was investigated by cross-zone fracture toughness test and the effect of martensite–austenite constituent in the simulated reheated zone of welds with different second peak temperature on toughness was analyzed. The results showed that the crack propagated in unstable manner in the reheated zone of welds where the martensite–austenite constituent promoted the initiation and propagation of the crack. The fine structure of martensite–austenite constituent contained retained austenite, martensite, and martensite–austenite mixture microstructure. The impact toughness deteriorated drastically in the incomplete phase transition zone for the simulated reheated zone of welds related to the formation of mixture microstructure in which large blocky martensite–austenite constituent at prior austenite grain boundaries and inside the grains were distributed in the shape of network.

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Article
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

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