Reheat Cracking Susceptibility in Coarse Grained Heat-affected Zone of SA508-4 Steel for Nuclear Pressure Vessel

doi:10.11901/1005.3093.2018.290

Chinese Journal of Materials Research

2019, Vol. 33

Issue (1): 72-80 DOI: 10.11901/1005.3093.2018.290

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Reheat Cracking Susceptibility in Coarse Grained Heat-affected Zone of SA508-4 Steel for Nuclear Pressure Vessel

Zhongyi CHEN,Yonglin MA(

),Shuqing XING,Qingwei BAI,Yongzhen LIU

Material and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010, China

Cite this article:

Zhongyi CHEN,Yonglin MA,Shuqing XING,Qingwei BAI,Yongzhen LIU. Reheat Cracking Susceptibility in Coarse Grained Heat-affected Zone of SA508-4 Steel for Nuclear Pressure Vessel. Chinese Journal of Materials Research, 2019, 33(1): 72-80.

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Abstract

The reheat cracking susceptibility of the coarse-grained heat affected zone (CGHAZ) of SA508-4N steel for nuclear pressure vessel was evaluated by stress-rupture tests at high temperature. The microstructure of the CGHAZ and base metal (BM), as well as the crack- and fracture- morphology were characterized by means of Laser confocal microscope, scanning electron microscopy and transmission electron microscopy. The results show that the microstructure of base metal is tempered martensite, while carbon and chromium content can affect the size and distribution of carbides. The formation of martensite in CGHAZ is not conducive to the suppression of reheat cracking. The precipitation of carbides causes the difference in the strength for grain and grain boundary. When the strength of grain is greater than that of grain boundary, intergranular brittle fracture could emerge. However, when the strength difference between the grain and grain boundary is small, both of the transgranular- and intergranular-fractures could occur. The CGHAZ of SA508-4N steel is not sensitive to reheat cracking, and the resistance to reheat cracking in the CGHAZ of steel A is better than that of Steel B. It follows that the optimum parameters in the actual welding for steel A are as follows: the welding t_8/5 is 25 s, and the post weld heat treatment temperature is 580^oC.

Key words: metallic materials reheat cracking welding thermal simulation reactor pressure vessel microstructure mechanical properties

Received: 24 April 2018

ZTFLH:

TG407

Fund: National Science and Technology Major Project of China(2009ZX04014-064-05);Inner Mongolia Natural Science Foundation(2016MS0510)

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	Zhongyi CHEN
	Yonglin MA
	Shuqing XING
	Qingwei BAI
	Yongzhen LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.290 OR https://www.cjmr.org/EN/Y2019/V33/I1/72

Table 1 Chemical composition of SA508-4N steel (mass fraction, %)

Fig.1 scheme of stress-rupture tests

Fig.2 Schematic diagram of tensile specimen (unit: mm)

Fig.3 Microstructures of SA508-4N steel (a) Steel A-OM, (b) Steel A-SEM, (c) Steel A-TEM, (d) Steel B-OM,(e) Steel B-SEM, (f) Steel B-TEM

Fig.4 Microstructure in CGHAZ of SA508-4N steel (a) Steel A-OM, (b) Steel A-SEM, (c) Steel A-TEM, (d) Steel B-OM,(e) Steel B-SEM, (f) Steel B-TEM

Fig.5 Strength and plasticity at high temperature (a) tensile strength, (b) reduction of area, (c) elongation

Fig.6 Cracks near the fracture of steel for different parameters (a) Steel A-550℃-50 s, (b) Steel B-550℃-50 s, (c) Steel A-610℃-50 s, (d) Steel B-610℃-50 s

Fig.7 Voids in the direction of crack propagation of steel for different parameters (a) Steel A-550℃-50 s, (b) Steel B-550℃-50 s, (c) Steel A-610℃-50 s, (d) Steel B-610℃-50 s

Fig.8 Fracture morphology of steel for different parameters (a) Steel A-550℃-25 s, (b) Steel A-610℃-150 s, (c) Steel B-550℃-25 s, (d) Steel B-610℃-150 s

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