Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate

doi:10.1007/s40195-024-01676-2

Acta Metallurgica Sinica (English Letters) ›› 2024, Vol. 37 ›› Issue (6): 1104-1114.DOI: 10.1007/s40195-024-01676-2

Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate

Yanyang Wu¹^,⁴, Zongye Ding¹^,²^,³(), Wenquan Lu¹, Jingchao Hou⁴, Qiaodan Hu¹(), Jianguo Li¹

¹Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
²State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
³School of Mechatronic Engineering and Automation, Foshan University, Foshan 528225, Guangdong, China
⁴WuYang Iron and Steel, Wugang 450000, Henan, China

Received:2023-10-06 Revised:2023-12-02 Accepted:2023-12-18 Online:2024-06-10 Published:2024-04-03
Contact: Zongye Ding,dingzongye@sjtu.edu.cn; Qiaodan Hu,qdhu@sjtu.edu.cn

Abstract

Abstract:

Ensuring the homogeneous and excellent mechanical properties of 2.25Cr-1Mo-0.25V ultra-thick steel plate is the key to the production of hydrogenation reactor equipment. Thus, it is required to understand the heterogeneity of microstructures and properties of ultra-thick plate after heat treatment. In this work, the effect of post-weld heat treatment (PWHT) on the strength, plasticity, toughness and microstructures of the 193-mm-thick steel plate was investigated, and the formation mechanism of heterogeneity was elucidated. The PWHT decreased the room- and high-temperature yield strength (YS) and ultimate tensile strength (UTS) of the steel plate after normalizing and tempering (NT), while the room- and high-temperature YS and UTS decreased from the surface to the center of 193-mm-thick steel plate. It was attributed to the enhanced decomposition of martensite-austenite (M-A) constituents and coarsening of grains and precipitated carbides.

Yanyang Wu, Zongye Ding, Wenquan Lu, Jingchao Hou, Qiaodan Hu, Jianguo Li. Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(6): 1104-1114.

Figures/Tables 11

Table 1 Chemical composition of the 2.25Cr-1Mo-0.25V steel plate (wt%)

C	Si	Mn	P	S	Cr	Mo	Ni	V	Cu
0.14	0.08	0.54	0.003	0.002	2.25–2.5	1.0–1.1	0.08	0.28–0.35	0.08

Fig. 1 PWHT of the 2.25Cr-1Mo-0.25V steel plate for different durations and cooling strategies

Fig. 2 Positions of the specimens extracted from the ultra-thick plate and schematic diagram of the tensile and impacted samples: a on the surface, b at the quarter position, c at the half position

Fig. 3 CCT diagram of 2.25Cr-1Mo-0.25V steel

Fig. 4 OM and SEM images of microstructures of 2.25Cr-1Mo-0.25V steel plate at different positions after without PWHT a-c, Min PWHT d-f and Max PWHT g-i: on the surface a, d, g, at the quarter position b, e, h and at the half position c, f, i

Fig. 5 Tensile strength and plasticity of the specimens at various positions of the 2.25Cr-1Mo-0.25V ultra-thick steel plate: a YS, b UTS, c elongation, d Rp0.2/Rm

Fig. 6 Impact work and fracture percentage of the specimens versus temperature after Min PWHT a, b and Max PWHT c, d

Fig. 7 Mechanical properties of the 2.25Cr-1Mo-0.25V steel after Max PWHT with different NT parameters

Fig. 8 Microstructures of the 2.25Cr-1Mo-0.25V steel after Max PWHT with various NT parameters

Fig. 9 High-temperature properties of the 193 mm-thick 2.25Cr-1Mo-0.25V steel plates at different positions after Min PWHT a, c and Max PWHT b, d

Fig. 10 a TEM image and b compositional analysis of the microstructure of the specimens after NT and Max PWHT c schematic diagram of microstructure evolution of the specimens after NT and PWHT

References 18

[1]	A.Q. Zuo, X. Liu, C.D. Shao, M.Z. Fan, N.S. Ma, F.G. Lu, Acta Metall. Sin. -Engl. Lett. 35, 1317 (2022)
[2]	G. Magudeeswaran, V. Balasubramanian, S. Sathyanarayanan, G.M. Reddy, A. Moitra, S. Venugopal, G. Sasikala, J. Iron. Steel Res. Int. 17, 51 (2010)
[3]	Y. Li, S. Huang, H. Hui, Y.L. Han, J.Y. Huang, Z.P. Chen, J. Mater. Sci. 58, 3802 (2023)
[4]	P. Tao, C. Zhang, Z.G. Yang, H. Takeda, J. Iron. Steel Res. Int. 17, 74 (2010)
[5]	Q. Wang, C.D. Shao, H.C. Cui, Y. Gao, F.G. Lu, Acta Metall. Sin. -Engl. Lett. 35, 714 (2022)
[6]	K. Ding, H.J. Hi, X. Liu, P. Wang, Q.L. Zhang, X.H. Li, Y.L. Zhao, J. Iron. Steel Res. Int. 25, 847 (2018)
[7]	M.H.S. Bidabadi, Y. Zheng, A. Rehman, C. Zhang, H. Chen, P. Hou, Z.G. Yang, J. Iron. Steel Res. Int. 26, 898 (2019)
[8]	X.Y. Li, Y. Jiang, K.F. Wu, W.L. Dong, F. Yang, X.W. Jia, X.L. Xu, J.H. Chen, R. Cao, Int. J. Pres. Ves. Pip. 193, 10445 (2021)
[9]	Y.M. Li, Y.H. Cui, J.M. Zhang, M.H. Song, C. Xu, Metals 12, 1978 (2022)
[10]	M.Y. Chai, M. Qin, Y.T. Zheng, X.L. Hou, Z.X. Zhang, G.X. Cheng, Q. Duan, Mater. Today Proc. 5, 13759 (2018)
[11]	K. Ding, H.J. Ji, Q.L. Zhang, X. Liu, P. Wang, X.H. Li, L. Zhang, Y.L. Gao, J. Iron. Steel Res. Int. 25, 839 (2018)
[12]	M.T. Ma, K.J. Li, Y. Si, P.J. Cao, H.Z. Lu, A.M. Guo, G.D. Wang, Acta Metall. Sin. -Engl. Lett. 36, 1144 (2023)
[13]	Z.H. Jiang, P. Wang, D.Z. Li, Y.Y. Li, Mater. Sci. Eng. A 699, 165 (2017)
[14]	Y.H. Li, Z.H. Jiang, Z.D. Yang, J.S. Zhu, Acta Metall. Sin. -Engl. Lett. 33, 1346 (2020)
[15]	M.B. Wang, R.D. Li, T.C. Yuan, H.O. Yang, P.D. Niu, C. Chen, Acta Metall. Sin. -Engl. Lett. 35, 354 (2022)
[16]	S.I. Rao, C. Woodward, B. Akdim, Acta Mater. 243, 118440 (2023)
[17]	Y. Han, J.Q. Sun, J.P. Sun, G.Q. Zu, W.W. Zhu, W. Ran, Acta Metall. Sin. -Engl. Lett. 34, 789 (2021)
[18]	Y.K. Mu, L.H. He, S.H. Deng, Y.F. Jia, Y.D. Jia, G. Wang, Q.J. Zhai, P.K. Liaw, C.T. Liu, Acta Mater. 232, 117975 (2022)

Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate

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