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Role of tempering cooling rate on impact toughness of 2CrMoV weld metal

Published online by Cambridge University Press:  23 March 2020

Tao Fang ,
Xia Liu ,
Chendong Shao ,
Haichao Cui  and
Fenggui Lu Open the ORCID record for Fenggui Lu [Opens in a new window]
Tao Fang
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Xia Liu
Affiliation:
Department of Technology Research and Development, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai200240, People's Republic of China
Chendong Shao
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Haichao Cui*
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Fenggui Lu*
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: haichaocui@sjtu.edu.cn
b)e-mail: Lfg119@sjtu.edu.cn
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Abstract

Tempering cooling rate plays a significant role in the impact toughness of 2CrMoV weld metal. Three different tempering cooling rate experiments were carried out; it is found that the impact toughness of weld metal improved from 44.61 to 117.49 J as the cooling rate increased from 5 to 40 °C/h. Microstructure characterization revealed that the large blocky M–A constituents and cluster precipitation were considered to act as stress concentration sources and cleavage fracture initiators at a cooling rate of 5 °C/h. Under the cooling rate of 20 °C/h, the decrease of blocky M–A constituents as well as homogeneous distribution of precipitation induced the transition from cleavage to interfacial decohesion. The chance of crack propagation in intragranular ferrite matrix was increased, which needed to absorb more energy and improve impact toughness. When the tempering cooling rate reached at 40 °C/h, the cracks mainly propagated in the ferrite matrix; meanwhile, fine and homogeneous distribution of precipitation greatly inhibited crack propagation and led to higher impact toughness.

Keywords

impact toughnesstempering cooling ratemicrostructureM–A constituentcrack propagation
Type
Novel Synthesis and Processing of Metals
Information
Journal of Materials Research , Volume 35 , Issue 12 , 29 June 2020 , pp. 1612 - 1621
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Copyright
Copyright © Materials Research Society 2020

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