Effect of C- and W-content on Microstructure and Toughness of Weld Metal for Low Alloy Cr-Mo Steel

doi:10.11901/1005.3093.2020.530

Chinese Journal of Materials Research

2021, Vol. 35

Issue (7): 481-492 DOI: 10.11901/1005.3093.2020.530

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Effect of C- and W-content on Microstructure and Toughness of Weld Metal for Low Alloy Cr-Mo Steel

ZHU Gaowen¹^,², WU Dong¹, LU Shanping¹(

)

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

ZHU Gaowen, WU Dong, LU Shanping. Effect of C- and W-content on Microstructure and Toughness of Weld Metal for Low Alloy Cr-Mo Steel. Chinese Journal of Materials Research, 2021, 35(7): 481-492.

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Abstract

The effect of C- and W-content on the microstructure and impact toughness of the weld metals for 2.25Cr1Mo steel weld via tungsten argon arc welding (TIG) technique was investigated by means of OM, SEM, EPMA, EBSD, thermal expansion- and impact-test. The results show that the microstructure of the multi-layer and multi-pass weld metal was heterogeneous, which can be divided into upper weld metal and intermediate weld metal. The upper weld metal can be divided into melting zone (MZ), coarse grain heat affected zone (CGHAZ), fine grain heat affected zone (FGHAZ), inter-critical heat affected zone (ICHAZ), inter-critically reheat coarse grain heat affected zone (ICCGHAZ) and sub-critical heat affected zone (SCHAZ). Intermediate weld metal composed of necklace-type microstructure which distribute along the prior austenite grain boundary and equiaxed crystal structure. The equiaxed crystal structure was tempered bainite with good toughness. Necklace-type microstructure composed of a large number of M-A constituents, which could easily cause stress concentration and promote crack initiation, whereas, deteriorate the toughness of weld metal. Increasing C content could promote the formation of lath bainite in upper weld metal and necklace-type microstructure in intermediate weld metal, which deteriorated the toughness of weld metal; However, increasing W content could promote the formation of lath bainite in upper weld metal and inhibit the formation of necklace-type microstructure in intermediate weld metal, which is beneficial to improving the toughness of weld metal.

Key words: metallic materials Cr-Mo weld metal element content necklace-type microstructure impact toughness

Received: 17 December 2020

ZTFLH:

TG424

Fund: Liaoning Municipal Science and Technology Project(2020JH1/10100001);Liaoning Natural Science Foundation(2019JH3/30100039)

About author: LU Shanping, Tel: (024)23971429, E-mail: shplu@imr.ac.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.530 OR https://www.cjmr.org/EN/Y2021/V35/I7/481

Table 1 Welding parameters of TIG

Fig.1 Schematic diagram of weld joint

Table 2 Chemical compositions of deposited metal and base metal (mass fraction, %)

Fig.2 Location of Charpy specimens

Fig.3 Parameters of thermal cycles

Fig.4 OM images of multi-pass weld metal (a) OM image of weld joint; (b) OM image of upper weld metal

Fig.5 SEM images of various zones in upper weld metal (a) Melt zone (MZ), (b) Coarse grain heat affected zone (CGHAZ), (c) Fine grain heat affected zone (FGHAZ), (d) Inter-critical heat affected zone (ICHAZ), (e) Inter-critical coarse grain heat affected zone (ICCGHAZ), (f) Sub-critical heat affected zone (SCHAZ)

Table 3 Range of welding thermal cycles of various zones in upper weld metal

Fig.6 Characterization of intermediate weld metal (a, b) OM images, (c) OM image of necklace microstructure, (d) OM image of equiaxed crystal microstructure

Fig.7 Characterization of necklace microstructure (a) SEM images, (b) Color image of necklace microstructure，(c-d) EPMA maps

Fig.8 EBSD analysis of necklace microstructure (a) Image quality map, (b) Phase map, (c) Kernel average misorientation map

Fig.9 OM images of weld metal microstructure in different C contents (a, d) 02C, (b, e) 05C, (c, f) 08C; (a~c) OM images, (d~f) color images (GB represents granular bainite, LB represents lath bainite, BF represents bainite ferrite)

Fig.10 CCT curves in different C contents (a) 02C, (b) 05C, (c) 08C (F represents ferrite, P represents pearlite)

Fig.11 OM images of weld metal microstructure in different C contents (a, d) 0W, (b, e) 04W, (c, f) 09W; (a~c) OM images, (d~f) color images

Fig.12 CCT curves in different W contents (a) 0W, (b) 04W, (c) 09W

Fig.13 Impact energy of weld metal in different C contents

Fig.14 SEM images of intermediate weld metal in different C contents (a, d) 02C, (b, e) 05C, (c, f) 08C; (a~c) necklace microstructure, (d~f) equiaxed crystal microstructure

Fig.15 SEM images of secondary cracks in different C contents (a) 02C, (b) 05C, (c) 08C

Fig.16 SEM images of secondary cracks (a) secondary cracks in necklace microstructure, (b) the enlarged view of the secondary crack

Fig.17 Impact energy of weld metal in different W contents

Fig.18 SEM images of intermediate weld metal in different W contents (a, d) 0W, (b, e) 04W, (c, f) 09W; (a~c) necklace microstructure, (d~f) equiaxed crystal microstructure

Fig.19 SEM images of secondary cracks in different W contents: (a) 0W, (b) 04W, (c) 09W

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