Influence of Ca treatment on effect of rare earth in C-Mn steel
XIE Yu-min1,2, SONG Ming-ming1,2, XUE Zheng-liang1,2, ZHU Hang-yu1,2, XU Run-sheng1,2, LIU Sheng1,2
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel Making, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract：To clarify the influence of Ca treatment on the effect of rare earth (RE) in C-Mn steel, scanning electron microscope, optical microscope, and ultra-depth three-dimensional microscope were used to observe the inclusion and microstructure for hot rolled test steels. Combining with thermodynamic calculation and impact fracture analysis, the influence of RE and Ca-RE complex treatment on the mechanical behavior of C-Mn steel was studied comparatively. The conclusions were as follows: after RE added into steel, the inclusion was changed into nearly spherical complex inclusions Si contained RE oxide, the size and aspect ratio of the inclusion decreased. For the steel treated by Ca-RE, almost all the inclusions became spherical complex inclusions of RE-Ca, and the cleanliness of steel increased. The Ca in steel increases the yield of RE from 7.6% to 42.4% improving the utilization rate of RE effectively. After the complex treatment of Ca-RE, the content of pearlite increased and so did in the strength of steel. All findings indicated that it is feasible to use Ca to improve the effect of RE in C-Mn steel.
谢毓敏, 宋明明, 薛正良, 朱航宇, 徐润生, 刘升. 钙处理对稀土在C-Mn钢中作用的影响[J]. 钢铁, 2020, 55(11): 30-36.
XIE Yu-min, SONG Ming-ming, XUE Zheng-liang, ZHU Hang-yu, XU Run-sheng, LIU Sheng. Influence of Ca treatment on effect of rare earth in C-Mn steel[J]. Iron and Steel, 2020, 55(11): 30-36.
[1] XIN W B, SONG B, SONG M M, et al. Effect of cerium on characteristic of inclusions and grain boundary segregation of arsenic in iron melts[J]. Steel Research International, 2015, 86(12): 1430. [2] Opiwla M, Grajcar A. Modification of non-metallic inclusions by rare-earth elements in microalloyed steels[J]. Archives of Foundry Engineering, 2012, 12(2): 129. [3] 董大西,杨超云,胡云生. 高洁净轴承钢中稀土变质夹杂物行为分析[J]. 中国冶金,2020,30(6): 30. (DONG Da-xi,YANG Chao-yun,HU Yun-sheng, et al. Analysis on modification behavior of rare earth to inclusions in high clean bearing steel[J]. China Metallurgy,2020,30(6): 30.) [4] 林勤,宋波,郭兴敏,等. 钢中稀土微合金化作用与应用前景[J]. 稀土,2001,22(4): 31. (LIN Qin, SONG Bo, GUO Xing-min, et al. Microalloying and application prospect of rare earth in steel[J]. Chinese Rare Earths, 2001, 22(4): 31.) [5] ZHAO Y Y, WANG J F, ZHOU S, et al. Effects of rare earth addition on microstructure and mechanical properties of a Fe-15Mn-1.5Al-0.6C TWIP steel[J]. Materials Science and Engineering: A, 2014, 608: 106. [6] YANG C, LUAN Y, LI D, et al. Effects of rare earth elements on inclusions and impact toughness of high-carbon chromium bearing steel[J]. Journal of Materials Science and Technology, 2019, 35(7): 1298. [7] 龙琼, 伍玉娇, 凌敏, 等. 稀土元素处理钢的研究进展及应用前景[J]. 炼钢, 2018, 34(1): 57.(LONG Qiong, WU Yu-jiao, LING Min, et al. Research amd Prosprct on rare earth treated steel[J]. Steelmaking, 2018, 34(1): 57.) [8] 杨吉春,王军,任磊,等. 铈对S32550双相不锈钢微观组织及冲击性能的影响[J]. 钢铁,2020,55(1): 86. (YANG Ji-chun, WANG Jun, REN Lei, et al. Effect of Ce on Microstructure and impact properties of S32550 duplex stainless steel[J]. Iron and Steel, 2020, 55(1): 86.) [9] Kim S T, Jeon S H, Lee I S, et al. Effects of rare earth metals addition on the resistance to pitting corrosion of super duplex stainless steel—Part 1[J]. Corrosion Science, 2010, 52: 1897. [10] Smirnov L A, Rovnushkin V A, Oryshchenko A S, et al. Modification of steel and alloys with rare-earth elements. Part 2[J]. Metallurgist, 2016, 60(1/2): 38. [11] Thewlis G. Effect of cerium sulphide particle dispersions on acicular ferrite microstructure development in steels[J]. Materials Science and Technology, 2013, 22(2): 153. [12] LIU H L,LIU C J, JIANG M F. Effect of rare earths on impact toughness of a low-carbon steel[J]. Materials and Design, 2012, 33: 306. [13] 罗磊, 孙彦辉, 陈永, 等. 钙处理工艺对管线钢非金属夹杂物的影响[J]. 钢铁, 2013, 48(1): 42.(LUO Lei, SUN Yan-hui, CHEN Yong, et al. Effect of calcium treatment on the non-metallic inclusions of pipeline steel[J]. Iron and Steel, 2013, 48(1): 42.) [14] Sardar M K, Mukhopadhyay S, Bandopadhyay B K, et al. Optimisation of inclusion chemistry by improved steel cleanliness and optimum calcium treatment[J]. Process Metallurgy-Steelmaking, 2007, 78(2): 136. [15] 刘建华, 包燕平, 王敏. X70管线钢钙处理研究[J]. 钢铁, 2010, 45(2): 41.(LIU Jian-hua, BAO Yan-ping, WANG Min. Investigation of calcium treatment in X70 pipeline steel[J]. Iron and Steel, 2010, 45(2): 41.) [16] 高胜亚, 姜敏, 侯泽旺, 等. 钙处理对高碳铝镇静钢中夹杂物的影响[J]. 钢铁, 2017, 52(4): 25.(GAO Sheng-ya, JIANG Min, HOU Ze-wang, et al. Effect of calciumtreatment on non-metallic inclusions in high carbon aluminum killed steel[J]. Iron and Steel, 2017, 52(4): 25.) [17] 吴战芳, 徐李军, 董富军, 等. 钙处理工艺对耐腐蚀船板钢低温韧性的影响[J]. 钢铁钒钛, 2016, 37(4): 133.(WU Zhan-fang, XU Li-jun, DONG Fu-jun, et al. Effect of calcium treatment on low temperature toughness of corrosion resistant steel[J]. Iron Steel Vanadium Titanium, 2016, 37(4): 133.) [18] 吕彦, 杨吉春, 李波, 等. Ca-RE复合处理对钢中硫化物的影响[J]. 包头钢铁学院学报, 2004, 23(2): 126.(LÜ Yan, YANG Ji-chun, LI Bo, et al. The Effect of compound treatment with Ca-RE on sulphide inclusion in steel[J]. Journal of Baotou University of Iron and Steel Technology, 2004, 23(2): 126.) [19] 秦紫瑞, 赵军, 钟蕊, 等. 低碳铸钢的RE-Ca复合变质处理的研究[J]. 稀土, 1995, 16(4): 22.(QIN Zi-rui, ZHAO Jun, ZHONG Rui, et al. Research on RE-Ca complex modification of low carbon cast steel[J]. Chinese Rare Earths, 1995, 16(4): 22.) [20] GB/T 1591-2008, 低合金高强度结构钢[S]. 北京:中国标准出版社,2009. (GB/T 1591-2008, High Strength Low Alloy Structural Steels[S]. Beijing: Standards Press of China, 2009.) [21] 史可庆, 蔺立元, 赵刚, 等. 42CrMo4钢锭镦粗裂纹的原因分析[J]. 热加工工艺, 2020, 49(3): 154. (SHI Ke-qing, LIN Li-yuan, ZHAO Gang, et al. Cause analysis of crack in 42CrMo4 steel ingot during upsetting[J]. Hot Working Technology, 2020, 49(3): 154.)
2020, Vol. 55 
