回火温度对改进型T23钢冲击吸收功的影响

doi:10.13228/j.boyuan.issn0449-749x.20200381

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摘要 T23钢较高的再热裂纹敏感性严重危害了超超临界火电厂的安全运行。前期通过成分改进得到的改进型T23钢再热裂纹敏感性得到了较大的改善,但冲击吸收功较低。为了提高改进型T23钢的冲击吸收功,研究了回火温度对改进型T23钢显微组织、硬度和冲击吸收功的影响。测量改进型T23钢750~810 ℃回火后的硬度和冲击吸收功,并利用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)分析显微组织。结果表明,随着回火温度升高,改进型T23钢硬度不断降低,冲击吸收功先升高后降低并在790 ℃回火后达到最大值。回火过程中基体组织软化、M-A组元分解和贝氏体板条宽化是造成改进型T23钢硬度不断下降的主要原因。与750 ℃回火相比,改进型T23钢790 ℃回火后的大尺寸M-A组元数量少且尺寸小,晶界仍存在一些尺寸较小的M₂₃C₆相,且贝氏体板条宽化程度较小,有效阻碍了裂纹的扩展,冲击吸收功最高。回火温度提高到810 ℃,小尺寸的M-A组元数量减少且M₂₃C₆相大量溶解,特别是贝氏体板条的严重宽化降低了对裂纹扩展的阻碍作用,冲击吸收功下降。

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	周任远
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	宋明

关键词 ：改进型T23钢, 回火温度, 显微组织, 硬度, 冲击吸收功

Abstract：The safety of ultra-super critical power plants is severely endangered by the high reheat-cracking susceptibility of T23. Our former experimental results showed that the reheat cracking susceptibility of modified T23 steel was highly improved by modifying the composition,but the impact absorbed energy decreased. In order to improve the impact absorbed energy of modified T23 steel, the effect of tempering temperature on the microstructure,hardness and impact absorbed energy of modified T23 steel was investigated in this paper. The hardness and impact absorbed energy of modified T23 steel after tempering at 750-810 ℃ were measured,and the microstructure was analyzed by optical microscope (OM),scanning electron microscope (SEM) and transmission electron microscope (TEM). The result shows that with increasing tempering temperature,the hardness of modified T23 steel decreases,while the impact absorbed energy increases firstly and then decreases. After tempering at 790 ℃,the impact absorbed energy reaches the maximum value. The main reasons for the decrease of hardness are the softening of matrix,the decomposition of M-A constitutes and the widening of bainitic laths. Compared with tempering at 750 ℃,the number of M-A constitutes with large size in modified T23 steel after tempering at 790 ℃ decreases,and the size is smaller. There are still some M₂₃C₆ carbides with small size at the grain boundaries, and the degree of bainitic lath widening is low. The crack propagation is hindered effectively,hence the impact absorbed energy is the highest. When the tempering temperature is increased to 810 ℃,the number of small M-A constitutes decreases and a large number of M₂₃C₆ carbides dissolve. In particular,the retarding effect of crack propagation is further reduced due to the severe widening of bainitic laths. Therefore,the impact absorbed energy decreases.

Key words： modified T23 steel tempering temperature microstructure hardness impact absorbed energy

收稿日期: 2020-07-27

引用本文:

周任远, 朱丽慧, 柯志刚, 李世贤, 翟国丽, 宋明. 回火温度对改进型T23钢冲击吸收功的影响[J]. 钢铁, 2021, 56(3): 51-57. ZHOU Ren-yuan, ZHU Li-hui, KE Zhi-gang, LI Shi-xian, ZHAI Guo-li, SONG Ming. Effect of tempering temperature on impact absorbed energy of modified T23 steel[J]. Iron and Steel, 2021, 56(3): 51-57.

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[1] 刘晓静. SA213-T23钢焊接工艺评定试验[C]//陕西省焊接学术会议论文集.西安:陕西省机械工程学会,2008:192.(LIU Xiao-jing. SA213-T23 steel welding procedure qualification test[C]//Shaanxi Welding Academic Conference.Xi′an:The Shaanxi Provincial Institute of Mechanical Engineering,2008:192.)
[2] 赵钦新,朱丽慧. 超临界锅炉耐热钢研究[M]. 北京:机械工业出版社,2010.(ZHAO Qin-xin,ZHU Li-hui. Research on Heat Resistant Steel for Supercritical Boiler[M]. Beijing:China Machine Press,2010.)
[3] 瓦卢瑞克·曼内斯曼钢管公司. T23/T24管材手册——水冷壁和过热器用新材料[C]//超(超)临界锅炉用钢及焊接技术论文集.西安:超(超)临界锅炉用钢及焊接技术协作网,2007:305.(Vallourec and MannesmannTubes. Handbook of T23/T24 pipes-new materials for water wall and superheater[C]//Steels and Welding Technology for Ultra Supercritical Boiler. Xi′an:Cooperation Network of Steel and Welding Technology for Ultra Supercritical Boiler,2007:305.)
[4] Masuyama F,Koyoyama T. Development of a tungsten strengthened low alloy steel with improved weldability[J]. Boiler Manufacturing,1996(4):30.
[5] 李宸庆,侯雅青,杨丽,等. 过/再热器管道高温蒸汽氧化相图计算[J]. 钢铁,2020,55(10):83.(LI Chen-qing,HOU Ya-qing,YANG Li,et al. Phase diagram calculation research of high temperature steam oxidation of superheater/reheater tube[J]. Iron and Steel,2020,55(10):83.)
[6] Viswanathan R,Nutting J. Advanced Heat Resistant Steel for Power Generation[M]. London:The Institute of Materials,1998.
[7] 周任远,朱丽慧,李世贤,等. T23再热裂纹敏感性的改善及其组织[J]. 钢铁,2020,55(3):80.(ZHOU Ren-yuan,ZHU Li-hui,LI Shi-xian,et al. Improvement of reheat-cracking susceptibility and microstructure of T23 steel[J]. Iron and Steel,2020,55(3):80.)
[8] 李振江,肖纳敏,李殿中,等. G18CrMo2-6钢回火组织及冲击韧性研究[J]. 金属学报,2014,50(7):777.(LI Zhen-jiang,XIAO Na-min,LI Dian-zhong,et al. Influence of microstructure on impact toughness of G18CrMo2-6 steel during tempering[J]. Acta Metallurgica Sinica,2014,50(7):777.)
[9] Gojic M,Kosec L,Matkovic P. The effect of tempering temperature on mechanical properties and microstructure of low alloy Cr and CrMo steel[J]. Journal of Materials Science,1998(33):395.
[10] 周任远,朱丽慧,李世贤,等. 改进型T23钢的再热裂纹敏感性[J]. 金属热处理,2020,45(1):20.(ZHOU Ren-yuan,ZHU Li-hui,LI Shi-xian,et al. Reheat cracking susceptibility of modified T23 steel[J]. Heat Treatment of Metals,2020,45(1):20.)
[11] Yu J,Mcmahon C J. The effects of composition and carbide precipitation on temper embrittlement of 2.25Cr1Mo steel:Part I. Effects of P and Sn[J]. Metallurgical and Materials Transactions A,1980,11(291):277.
[12] LUO Y,PENG J M,WANG H B,et al. Effect of tempering on microstructure and mechanical properties of a non-quenched bainitic steel[J]. Materials Science and Engineering A,2010,527(15):3433.
[13] Mohseni P,Solberg J K,Karlsen M,et al. Cleavage fracture initiation at M-A constituents in intercritically coarse-grained heat-affected zone of a HSLA steel[J]. Metallurgical and Materials Transactions A,2014,45(1):384.
[14] Lee Seong-Hyeong,Na Hye-Sung,Lee Kyong-Woon. Microstructural characteristics and M₂₃C₆ precipitate behavior of the course-grained heat-affected zone of T23 steel without post-weld heat treatment[J]. Metals,2018,8(3):170.
[15] 蒋中华,王培,李殿中,等. 回火温度对2.25Cr-1Mo-0.25V钢粒状贝氏体显微组织和力学性能的影响[J]. 金属学报,2015,51(8):925.(JIANG Zhong-hua,WANG Pei,LI Dian-zhong,et al. Effects of tempering temperature on the microstructure and mechanical properties of granular bainite in 2.25Cr-1Mo-0.25V steel[J]. Acta Metallurgica Sinica,2015,51(8):925).
[16] 于庆波,孙莹,倪宏昕,等. 不同类型的贝氏体组织对低碳钢力学性能的影响[J]. 机械工程学报,2009,45(12):284.(YU Qing-bo,SUN Ying,NI Hong-xin,et al. Effect of different bainitic microstructure on the mechanical properties of low-carbon steel[J]. Journal of Mechanical Engineering,2009,45(12):284.)
[17] 胡光立,刘正堂,王平,等. 几种结构钢的回火贝氏体脆性[J]. 金属学报,1989,25(2):34.(HU Guang-li,LIU Zheng-tang,WANG Ping,et al. Tempered bainite embrittlement in some structural steels[J]. Acta Metallurgica Sinica,1989,25(2):34.)
[18] 万德成,余伟,李晓林,等. 淬火温度对550 MPa级厚钢板显微组织和力学性能的影响[J]. 金属学报,2012,48(4):455.(WAN De-cheng,YU Wei,LI Xiao-lin,et al. Effect of quenching temperature on microstructure and mechanical properties of 550 MPa grade thick steel plate[J]. Acta Metallurgica Sinica,2012,48(4):455.)
[19] XIE Chang-sheng,LIU Zheng-dong,HE Xi-kou,et al. Effect of martensite-austenite constituents on impact toughness of pre-tempered MnNiMo bainitic steel[J]. Materials Characterization,2020,161:110139.
[20] JIN Yu-jing,ZHOU Wei. Hot ductility loss and recovery in the CGHAZ of T23 steel during post-weld heat treatment at 750 ℃[J]. ISIJ International,2017,57(3):517.
[21] 陈俊丹,莫文林,王培,等. 回火温度对42CrMo钢冲击韧性的影响[J]. 金属学报,2012,48(10):1186.(CHEN Jun-dan,MO Wen-lin,WANG Pei,et al. Effect of tempering temperature on the impact toughness of steel 42CrMo[J]. Acta Metallurgica Sinica,2012,48(10):1186).
[22] 高古辉,张寒,白秉哲. 回火温度对Mn系低碳贝氏体钢的低温韧性的影响[J]. 金属学报,2011,47(5):513.(GAO Gu-hui,ZHANG Han,BAI Bing-zhe. Effect of tempering temperature on low temperature impact toughness of a low carbon Mn-steel batnite steel[J]. Acta Metallurgica Sinica,2011,47(5):513).