Study on Microstructure and Mechanics Properties of 2.25Cr-1Mo-0.25V Steel Fabricated by CMT Wire ARC Additive Manufacturing for Petrochemical Vessels

被引：0
|
作者：
Zhong Y. [1 ]
Qin X. [1 ]
Zheng Z. [1 ]
Li J. [1 ]
Wang C. [2 ]
机构：
[1] Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan
[2] Erzhong(Deyang) Heavy Equipment Co., Ltd., Deyang
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2022年 / 33卷 / 10期
关键词：
2.25Cr-1Mo-0.25V steel; Mechanics property; Microstructure; Minimum heat treatment; Wire arc additive manufacturing;
D O I：
10.3969/j.issn.1004-132X.2022.10.015
中图分类号：
学科分类号：
摘要：
In order to explore the new manufacturing processes of large petrochemical cylinder root edges, a newly self-developed 2.25Cr-1Mo-0.25V flux-cored wire was firstly used to deposit 2.25Cr-1Mo-0.25V straight-walls based on cold metal transfer and wire arc additive manufacturing(CMT-WAAM), and the best post-weld heat treatment was explored to improve microstructure and mechanics properties. The experimental results show that the internal microstructure of the straight-walls deposited by CMT-WAAM are mainly composed of lathy bainite, granular bainite and some martensites, with obvious differences in the building direction, dramatic floating micro-hardness and much higher tensile strength than that of the base metal, but lower fracture elongation. After applying "hydrogen elimination treatment+stress relief treatment" and "simulated minimum post-weld heat treatment" on the deposited walls, the latter was found to increase the plasticity to a level comparable to the base metal. Microstructure observations reveal that original lathy-bainite and partial martensite may be transformed into the uniformly distributed granular bainite after the "minimum post-weld heat treatment", and the microstructural anisotropy may be significantly reduced. The experiments prove that the newly developed 2.25Cr-1Mo-0.25V wire may be used to deposit straight-walls under the optimal parameters, the subsequent "minimum post-weld heat treatment" may improve microstructure and mechanics properties to the greatest extent, which finally meet the service specifications of petrochemical vessel root edges. Compared with the casting-forging processes, CMT-WAAM is expected to significantly save production costs and improve manufacturing efficiency. © 2022, China Mechanical Engineering Magazine Office. All right reserved.
引用
收藏
页码：1251 / 1259
页数：8
相关论文
共 33 条
  • [1] YE Jing, Research on High Temperature Fatigue Crack Propagation Law of 2.25Cr1Mo and 2.25Cr1MoV Steel, Chemical Equipment Technology, 1, pp. 49-53, (2006)
  • [2] NIE Yingxin, Current Situation of Manufacturing of Large Petro Chemical Pressure Vessels, Pressure Vessel Technology, 27, 8, pp. 33-39, (2010)
  • [3] SONG Liping, SUN Ronglu, GU Wen, Et al., Study on Impact Properties and Microstructure of Welded Joints on 2.25Cr-1Mo-0.25V, Transactions of the China Welding Institution, 34, 12, pp. 105-108, (2013)
  • [4] XUE Wei, LI Nan, DANG Zhaokai, Et al., 2.25Cr-1Mo-0.25V Steel Heat Treatment Process Test, Pressure Vessel Technology, 21, 10, pp. 10-13, (2004)
  • [5] XUE Wei, ZHOU Qi, Tests of the Welding Properties on 2.25Cr-1Mo-0.25V Steel for Making Hydro-reactor Vessels, Electric Welding Machine, 39, 11, pp. 91-93, (2009)
  • [6] HAN Yichun, Study on the Mechanism of Reheat Cracking in 2.25Cr-1Mo-0.25V Steel, (2015)
  • [7] MEI Lihua, WEI Gang, Fabrication of Hydrotreating Reactor Made of 2.25Cr-1Mo-0.25V Steel, Pressure Vessel Technology, 11, 20, pp. 36-42, (2003)
  • [8] LI Yan, SU Chen, ZHANG Jixiang, A Review of Wire Arc Additive Manufacturing from Aspects of Physical Process, Research Status, Application Situation and Development Trend, Welding & Jointing, 9, pp. 31-37, (2020)
  • [9] LI Mingxiang, ZHANG Tao, YU Fei, Et al., Research Progress of Wire and Arc Additive Manufacturing and Hybrid Manufacturing Technology for Metal Components, Aeronautical Manufacturing Technology, 62, 17, pp. 14-21, (2019)
  • [10] WANG Xiaoguang, LIU Fencheng, FANG Ping, Et al., Study on the Forming Accuracy, Microstructure and Properties of 316L Stainless Steel Manufactured by CMT Wire Arc Additive Manufacturing, Transactions of the China Welding Institution, 40, 5, pp. 106-112, (2019)
1234