节镍型高氮奥氏体不锈钢固溶处理加热过程中的组织演变
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摘要
对节镍型高氮奥氏体不锈钢进行固溶处理,通过控制加热温度和保温时间,研究高氮奥氏体不锈钢组织的变化规律。结果表明,800℃保温1 h后微观组织中出现混晶,在变形组织的晶界处产生细小的动态再结晶晶粒。在900～1050℃,随温度的升高,再结晶晶粒数量增多,尺寸增大。保温时间的增长会导致晶粒逐渐长大。在1200℃保温,晶粒尺寸从保温0. 5 h时的70μm增长到保温1 h时的117μm,此时晶粒最为均匀。平均晶粒尺寸随时间的变化呈抛物线增长,符合Beck方程:=105. 1t~(0. 45)。并根据试验得到试验钢的最佳热处理方式为1050～1200℃保温1 h。
Solution heat treatment of low-nickel high nitrogen austenitic stainless steel was carried out,and microstructure evolution of the steel was researched by controlling the temperature and the holding time. The results show that mixed grains are found at 800 ℃ for 1 h,fine dynamic recrystallization grains appear at the grain boundaries of the deformed microstructure. At 900-1050 ℃,with increase of the temperature,the number of recrystallized grains increases and the grain size increases. Holding at 1200 ℃,the average grain size increases from 70 μm at 0. 5 h after incubation to 117 μm at 1 h,whereupon the grains are the most uniform. The average grain size shows a parabolic growth law with time,in accordance with Beck equation: D-= 105. 1t~(0. 45). According to the experiment,the best heat treatment for the steel is holding at 1050-1200 ℃ for 1 h.
Solution heat treatment of low-nickel high nitrogen austenitic stainless steel was carried out,and microstructure evolution of the steel was researched by controlling the temperature and the holding time. The results show that mixed grains are found at 800 ℃ for 1 h,fine dynamic recrystallization grains appear at the grain boundaries of the deformed microstructure. At 900-1050 ℃,with increase of the temperature,the number of recrystallized grains increases and the grain size increases. Holding at 1200 ℃,the average grain size increases from 70 μm at 0. 5 h after incubation to 117 μm at 1 h,whereupon the grains are the most uniform. The average grain size shows a parabolic growth law with time,in accordance with Beck equation: D-= 105. 1t~(0. 45). According to the experiment,the best heat treatment for the steel is holding at 1050-1200 ℃ for 1 h.
引文
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[2]赵英利,李建新,张雲飞,等.高氮不锈钢热轧开裂原因分析及工艺改进[J].河北冶金,2015(4):53-55.Zhao Yingli,Li Jianxin,Zhang Yunfei,et al.Reason analysis and process improvement for cracks on high-nitrogen stainless steel in hot rolling[J].Hebei Metallurgy,2015(4):53-55.
[3]Li H B,Jiao W C,Feng H,et al.Influence of austenitizing temperature on the microstructure and corrosion resistance of 55Cr18Mo1VNhigh-nitrogen plastic mould steel[J].Acta Metallurgica Sinica,2016,29(12):1-13.
[4]Zhao H C,Ren Y B,Dong J H,et al.Effect of cold deformation on the friction-wear property of a biomedical nickel-free high-nitrogen stainless steel[J].Acta Metallurgica Sinica,2016,29(3):217-227.
[5]Pan S,Dengping J I.Development and application of nitrogen-alloyed austenitic stainless steels in Baosteel[J].Baosteel Technical Research,2015,9(4):26-31.
[6]任伊宾,杨柯,张炳春,等.真空感应炉充氩冶炼高氮Cr-MnMo-Cu奥氏体不锈钢[J].特殊钢,2004,25(4):13-15.Ren Yibin,Yang Ke,Zhang Bingchun,et al.High nitrogen Cr-MnMo-Cu austenite stainless steel melted by vacuum induction furnace filled argon[J].Special Steel,2004,25(4):13-15.
[7]蔡永成.VHD法吹氮气冶炼气阀钢5Cr21Mn9Ni4N[J].特殊钢,1999,20(3):48-49.Cai Yongcheng.Blasting nitrogen in VHD ladle for melting valve steel5Cr21Mn9Ni4N[J].Special Steel,1999,20(3):48-49.
[8]李刚,李京社,杨树峰,等.含氮不锈钢氮气增氮的实验及工艺[J].北京科技大学学报,2009(S1):84-87.Li Gang,Li Jingshe,Yang Shufeng,et al.Experiment and technology of adding nitrogen in nitrogen-containing stainless steels by blowing nitrogen gas[J].Journal of University of Science and Technology Beijing,2009(S1):84-87.
[9]李扬,刘雅政,何建中,等.CSP工艺中铌的析出特性及对微观组织的影响[C]//2005中国钢铁年会.2005:810-814.Li Yang,Liu Yazheng,He Jianzhong,et al.Effect of Nb precipitation on the microstructure by CSP technology[C]//Proceedings of 2005China Steel Annual Conference.2005:810-814.
[10]吴新朗,赵征志,余威,等.低碳微合金钢中Nb、Ti碳氮化物的回溶行为研究[J].钢铁钒钛,2009,30(1):29-33.Wu Xinlang,Zhao Zhengzhi,Yu Wei,et al.Dissolution behavior of Nb,Ti carbonitride precipitates in low carbon microalloyed steel[J].Iron Steel Vanadium Titanium,2009,30(1):29-33.
[11]丁海峰,杨吉春,张春香,等.固溶处理对304L不锈钢晶粒长大及力学性能的影响[J].材料热处理学报,2016,37(8):102-107.Ding Haifeng,Yang Jichun,Zhang Chunxiang,et al.Effect of solution treatment on grain growth and mechanical properites of 304Lstainless steel[J].Transactions of Materials and Heat Treatment,2016,37(8):102-107.
[12]Beck P A,Kremer J C,Demer L J.Grain growth in high purity aluminum and in aluminum-magnesium alloy[J].Trans AIME,1948,175:375-397.