Abstract: Welding, as a common manufacturing method, is an indispensable part of the promotion and application of duplex stainless steel (DSS). However, the microstructure evolution behavior of the heat affected zone (HAZ) during multilayer and multipass welding of duplex stainless steel is still unclear. The influence of ferritization and reheating process on microstructure evolution at HAZ of UNS S32750 duplex stainless steel welding was studied by Gleeble3500 thermal simulator, thermodynamic methods and microstructure characterization techniques. The results show that the alternating bands of ferrite and austenite were transformed into coarse and equiaxed metastable ferrite as well as different types of primary austenite (γ1) after ferritization of HAZ, and the austenite content was significantly reduced. In addition, a large amount of Cr2N was precipitated within the ferrite grain, at the ferrite and ferrite grain boundary, as well as in the ferrite and austenite phase boundary. Furthermore, the subsequent reheating temperature after ferritization had a significant effect on the microstructure of the HAZ. With the increase of reheating temperature in the range from 900 ℃ to 1 200 ℃, the austenite gradually increased. At the same time, the higher reheating temperature can also decrease the precipitation tendency of Cr2N. In addition, secondary austenite (γ2) is easily precipitated at the reheating temperature of 1 000 ℃. Furthermore, γ2 and Cr2N exhibited an obvious assisted precipitation behavior.
通讯作者: *郭志永,中国民航大学航空工程学院讲师、硕士研究生导师。2012年河北工业大学机械设计制造及其自动化专业本科毕业,2014年、2018年于天津大学机械工程专业分别获得硕士和博士学位,而后到中国民航大学工作至今。目前主要从事电弧增材制造技术与装备方面的研究工作。发表论文10余篇,包括Mechanical Systems and Signal Processing、Applied Surface Science、Precision Engineering、Robotics and Computer-Integrated Manufactu-ring 等。zyguo@cauc.edu.cn
1 Li H W, Zhao Z Y, Xue R D. Transactions of the China Welding Institution, 2022, 43(2), 20 (in Chinese). 栗宏伟, 赵志毅, 薛润东. 焊接学报, 2022, 43(2), 20. 2 Gao Z Q, Jing H Y, Xu L Y, et al. Transactions of the China Welding Institution, 2019, 40(7), 143 (in Chinese). 高站起, 荆洪阳, 徐连勇, 等. 焊接学报, 2019, 40(7), 143. 3 Dandekar T R, Gupta A, Khatirkar R K, et al. Transactions of the Indian Institute of Metals, 2021, 74, 2267. 4 Zhang Z Q, Jing H Y, Xu L Y, et al. Journal of Materials Heat Treatment, 2020, 41(5), 15 (in Chinese). 张志强, 荆洪阳, 徐连勇, 等. 材料热处理学报, 2020, 41(5), 15. 5 Yang Y Z, Wang Z Y, Tan H, et al. Corrosion Science, 2012, 65, 472. 6 Kim H J, Jeon S H, Kim S T, et al. Corrosion Science, 2014, 87, 60. 7 Chehuan T, Dreilich V, de Assis K S, et al. Corrosion Science, 2014, 86, 268. 8 Zhang Z Q, Jing H Y, Xu L Y, et al. Applied Surface Science, 2018, 435, 352. 9 Taban E, Kaluc E. Welding in the World, 2011, 55, 48. 10 Knyazeva M, Pohl M. Metallography, Microstructure, and Analysis, 2013, 5(2), 343. 11 Ferro P, Fabrizi A, Bonollo F, et al. Acta Metallurgica Slovaca, 2021, 27(2), 57. 12 Zhang Z Q, Jing H Y, Xu L Y, et al. Transactions of the China Welding Institution, 2017, 38(5), 79 (in Chinese). 张志强, 荆洪阳, 徐连勇, 等. 焊接学报, 2017, 38(5), 79. 13 Zhang Z Q, Jing H Y, Xu L Y, et al. Applied Surface Scienc, 2017, 404(15), 110. 14 Ramirez A J, Lippold J C, Brandi S D. Metallurgical and Materials Transactions A, 2003, 34(8), 1575. 15 Hosseini V A, Bermejo M, Gårdstam J, et al. Welding in the World, 2016, 60(2), 233. 16 Zhang Z Q, Jing H Y, Xu L Y, et al. Applied Surface Science, 2017, 26(1), 134. 17 Zhang Z Q, Jing H Y, Xu L Y, et al. Corrosion Science, 2017, 120, 194.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2023, Vol. 37 
