Control of δ-ferrite content and austenite grain size in 0Cr16Ni5Mo martensite stainless steel

doi:10.13251/j.issn.0254-6051.2022.09.034

Abstract

Abstract: δ-ferrite content of 0Cr16Ni5Mo steel was found to exceed the value specified in the technical agreement. In order to reduce the content of δ-ferrite while control the austenite grain size to meet the service requirement, the causes of ferrite formation were analyzed through theoretical calculations and thermodynamic simulation, and the microstructure and change of δ-ferrite content of the 0Cr16Ni5Mo steel were investigated by means of quenching and high temperature diffusion treatment at different temperatures. In addition, two kinds of cyclic heat treatments were used to control the austenitic grain size. The test results show that with the increase of quenching temperature, the austenite grain size of the 0Cr16Ni5Mo steel increases continuously, but the reduction of δ-ferrite content is relatively limited. The high temperature diffusion can reduce the δ-ferrite content obviously, however, when the diffusion temperature is higher than the transformation temperature of austenite to δ-ferrite, the δ-ferrite dissolution is relatively delayed. After high temperature diffusion at 1130 ℃, a variable temperature cyclic phase transformation heat treatment at 850 ℃ and 830 ℃ can be used to eliminate the martensitic inheritance and uniformly refine the austenitic grains.

Key words: 0Cr16Ni5Mo steel, microstructure, δ-ferrite, heat treatment, austenite grain size

CLC Number:

TG161

Tian Wei, Pan Wei, Zhong Qingyuan. Control of δ-ferrite content and austenite grain size in 0Cr16Ni5Mo martensite stainless steel[J]. Heat Treatment of Metals, 2022, 47(9): 194-201.

References

[1]中国特钢企业协会不锈钢分会. 不锈钢实用手册[M]. 北京: 中国科学技术出版社, 2003.
[2]白鹤, 王伯健. 马氏体不锈钢成分、工艺和耐蚀性的进展[J]. 特殊钢, 2009, 30(2): 30-33.
Bai He, Wang Bojian. Progress in chemical composition, process and corrosion resistance of martensite stainless steel[J]. Special Steel, 2009, 30(2): 30-33.
[3]孙霞, 刘春明. 铸造低碳马氏体不锈钢的现状与发展趋势[J]. 铸造, 2007, 56(1): 1-5.
Sun Xia, Liu Chunming. Status and tendency of development for cast low carbon martensitic stainless steel[J]. Foundry, 2007, 56(1): 1-5.
[4]邓德伟, 陈蕊, 田鑫, 等. 热处理对17-4PH马氏体不锈钢显微组织及性能的影响[J]. 金属热处理, 2013, 38(4): 32-36.
Deng Dewei, Chen Rui, Tian Xin, et al. Influence of heat treatment on microstructure and properties of 17-4PH martensitic stainless steel[J]. Heat Treatment of Metals, 2013, 38(4): 32-36.
[5]陈世修, 秦宗琼. 奥氏体不锈钢中铁素体含量的计算[J]. 阀门, 2005(1): 20-25.
Chen Shixiu, Qin Zongqiong. Calculation of ferrite content in austenitic steel[J]. Valve, 2005(1): 20-25.
[6]刘正东, 程世长, 包汉生, 等. 高铬马氏体耐热钢中δ-铁素体形成及影响因素[J]. 材料热处理学报, 2010, 31(11): 61-67.
Liu Zhengdong, Cheng Shichang, Bao Hansheng, et al. Formation and influence factors of δ ferrite in high Cr martensitic heat resistant steel[J]. Transactions of Materials and Heat Treatment, 2010, 31(11): 61-67.
[7]赵美兰. 马氏体钢中δ-铁素体的表征及影响[J]. 一重技术, 2011(2): 31-35.
Zhao Meilan. Characteristics of δ-ferrite and its effect on impact property in martensitic heat resistant steel[J]. CFHI Technology, 2011(2): 31-35.
[8]李港志, 祁凯, 朱永飞, 等. 2507超级双相不锈钢激光焊接接头组织和力学性能研究[J]. 江苏科技大学学报(自然科学版), 2017, 31(2): 148-152.
Li Gangzhi, Qi Kai, Zhu Yongfei, et al. Study of microstructure and mechanical properties of 2507 super duplex stainless steel welded joint by laser welding[J]. Journal of Jiangsu University of Science and Technology (Natural Science Edition), 2017, 31(2): 148-152.
[9]卜铁伟. 热处理对马氏体不锈钢显微组织和性能影响[J]. 热加工工艺, 2017, 46(16): 216-219.
Bu Tiewei. Effects of heat treatment on microstructure and mechanical properties of martensitic stainless steel[J]. Hot Working Technology, 2017, 46(16): 216-219.
[10]袁武华, 龚雪辉, 孙永庆, 等. 0Cr16Ni5Mo低碳马氏体不锈钢的热变形行为及其热加工图[J]. 材料工程, 2016(5): 8-14.
Yuan Wuhua, Gong Xuehui, Sun Yongqing, et al. Hot deformation behavior and processing map of 0Cr16Ni5Mo low carbon martensitic stainless steel[J]. Journal of Materials Engineering, 2016(5): 8-14.
[11]李太江, 李勇, 李巍, 等. 热处理对0Cr16Ni5Mo不锈钢焊接接头性能的影响[J]. 金属热处理, 2015, 40(11): 120-125.
Li Taijiang, Li Yong, Li Wei, et al. Effect of heat treatment on properties of 0Cr16Ni5Mo stainless steel welded joints[J]. Heat Treatment of Metals, 2015, 40(11): 120-125.
[12]许锋, 薛克敏, 李萍, 等. 循环相变超细化20CrMnTi钢晶粒[J]. 金属功能材料, 2011, 18(3): 63-66.
Xu Feng, Xue Kemin, Li Ping, et al. Grain ultra-refinement of cycling phase transformation in 20CrMnTi steel[J]. Metallic Functional Materials, 2011, 18(3): 63-66.
[13]姜越, 周蓓蓓, 艾莹莹, 等. 循环相变对00Cr13Ni7Co5Mo4Ti马氏体时效不锈钢晶粒细化和力学性能的影响[J]. 特殊钢, 2012, 33(3): 41-43.
Jiang Yue, Zhou Beibei, Ai Yingying, et al. Effect of recycling phase transformation on grain refinement and mechanical properties of maraging stainless steel 00Cr13Ni7Co5Mo4Ti[J]. Special Steel, 2012, 33(3): 41-43.
[14]朱景川, 尹钟大, 罗鸿, 等. 18Ni(200)马氏体时效钢的循环相变晶粒细化新工艺[J]. 钢铁, 2001(6): 52-55, 28.
Zhu Jingchuan, Yin Zhongda, Luo Hong, et al. A new cyclic phase transformation technology for grain refinement of 18Ni(200) maraging steel[J]. Iron and Steel, 2001(6): 52-55, 28.
[15]罗强, 宋逸思, 李传维, 等. 0Cr16Ni5Mo1马氏体不锈钢奥氏体化动力学研究[J]. 热处理, 2021, 36(2): 1-6.
Luo Qiang, Song Yisi, Li Chuanwei, et al. Study on kinetics of austenization of 0Cr16Ni5Mo1 martensitic stainless steel[J]. Heat Treatment, 2021, 36(2): 1-6.
[16]罗文英, 蒋静, 刘宪民, 等. 18Ni马氏体时效钢循环相变细晶工艺研究[J]. 热加工工艺, 2012, 41(16): 194-196, 199.
Luo Wenying, Jiang Jing, Liu Xianmin, et al. Study on grain refinement of 18Ni maraging steel by cyclic transformation[J]. Hot Working Technology, 2012, 41(16): 194-196, 199.
[17]应俊龙, 巢昺轩, 蒋克全, 等. CrWMn循环相变超细化工艺研究[J]. 热处理技术与装备, 2018, 39(6): 44-47.
Ying Junlong, Chao Bingxuan, Jiang Kequan, et al. Research on ultrafining process of CrWMn cycle phase transition[J]. Heat Treatment Technology and Equipment, 2018, 39(6): 44-47.