As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel

Wang Yinghu; Zheng Huaibei; Fang Yi; Liu Tingyao; Wang Liwei; Yao Bin

doi:10.7513/j.issn.1004-7638.2022.06.025

Volume 43 Issue 6

Jan. 2023

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Wang Yinghu, Zheng Huaibei, Fang Yi, Liu Tingyao, Wang Liwei, Yao Bin. As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025

Citation:

Wang Yinghu, Zheng Huaibei, Fang Yi, Liu Tingyao, Wang Liwei, Yao Bin. As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025

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As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel

doi: 10.7513/j.issn.1004-7638.2022.06.025

Wang Yinghu^{1, 2
,},
Zheng Huaibei^{1, 2},
Fang Yi³,
Liu Tingyao^{1, 2},
Wang Liwei³,
Yao Bin³

1.
Chengdu Advanced Metal Material Industry Technology Research Institute Co., Ltd., Chengdu 610300, Sichuan, China
2.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China
3.
Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangyou 621704, Sichuan, China

Received Date: 2022-03-09
Publish Date: 2023-01-13

Abstract

Abstract

The as-cast structure and mechanical properties of Y12Cr18Ni9 free-cutting steel were studied by means of thermodynamic calculation software FactSage, SEM and Phenom Partical X SEM-EDS. The results show that the main equilibrium phases in Y12Cr18Ni9 free-cutting steel are Liquid, MnS, δFerrite, Austenite, M₂₃C₆, Ferrite and Sigma. The equilibrium phase transition path is as follows: Liquid→Liquid+δFerrite→Liquid+δFerrite+Austenite→Liquid+δFerrite+MnS+Austenite→δFerrite+MnS+Austenite→MnS+Austenite→MnS+M₂₃C₆+Austenite→MnS+M₂₃C₆+Austenite+Ferrite→MnS+M₂₃C₆+Sigma+Austenite+Ferrite. The sulfides in the test steel are spherical, ellipsoidal, spindle shape or short-bar-like, and distributed in clusters along the grain boundary, belonging to a type II sulfide. The proportion of sulfides with length-width ratio≤3 reaches 94.75%, the proportion of sulfides with size ≤3 μm is 80.22%, and the proportion of sulfides with maximum chord length ≤3 μm is 76.02%. The cluster sulfides affect the mechanical properties of Y12Cr18Ni9 free cutting steel. The cluster sulfides distributed along the grain boundary is the main reason for the formation of quasi cleavage surface. The tensile strength, yield strength, elongation after fracture, reduction of area and impact toughness of the steel are 597 MPa, 233 MPa, 17.7%, 19.5% and 21.8 J, respectively.
- Y12Cr18Ni9 free-cutting steel,
- FactSage software,
- sulfide,
- mechanical property,
- microstructure

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References(25)

References

[1]	Zhao Maiqun, Wang Weike, Zhang Hao, et al. Analysis on sulphide inclusions in free-cutting 42CrMoS steel modified by rare earth elements[J]. Heat Treatment of Metals, 2004,29(11):20−23. (赵麦群, 王伟科, 张颢, 等. 稀土改性42CrMoS易切削钢中的硫化物夹杂分析[J]. 金属热处理, 2004,29(11):20−23. doi: 10.3969/j.issn.0254-6051.2004.11.007
[2]	Wang Jinlong, Qiao Aiyun, Zhang Xinggang. Summary on mechanical of machinability and control of sulfide for sulphur free-cutting steel[J]. Science and Technology of Baotou Steel, 2015,41(1):30−32. (王金龙, 乔爱云, 张行刚. 含硫易切削钢切削性机理与硫化物控制简述[J]. 包钢科技, 2015,41(1):30−32. doi: 10.3969/j.issn.1009-5438.2015.01.010
[3]	Wang Xiaohong, Xie Bing, Feng Zhongyu. Present status and development of research on free cutting steel at home and abroad[J]. Special Steel, 2005,26(4):26−28. (王小红, 谢兵, 冯仲渝. 国内外易切削钢的现状和研究进展[J]. 特殊钢, 2005,26(4):26−28. doi: 10.3969/j.issn.1003-8620.2005.04.008
[4]	Lo K H, Shek C H, Lai J K L. Recent development in stainless steels[J]. Materials Science and Engineering Reports, 2009,65(4-6):39−104. doi: 10.1016/j.mser.2009.03.001
[5]	Liu Zhenbao, Liang Jianxiong, Su Jie, et al. Research and application progress in ultra-high strength stainless steel[J]. Acta Metallurgica Sinica, 2020,56(4):549−557. (刘振宝, 梁剑雄, 苏杰, 等. 高强度不锈钢的研究及发展现状[J]. 金属学报, 2020,56(4):549−557. doi: 10.11900/0412.1961.2019.00453
[6]	Luo Gang, Wang Huimian. Test and study on relative hot plasticity of MnS inclusion in a new free-cutting stainless steel TBPS[J]. Special Steel, 2016,37(2):5−7. (罗刚, 王辉绵. 新型易切削不锈钢TBPS中MnS夹杂相对热塑性的试验研究[J]. 特殊钢, 2016,37(2):5−7.
[7]	Ramalingam S, Basu K, Malkin S. Deformation index of MnS inclusions in resulphurized and leaded steels[J]. Material Science and Engineering, 1977,29(2):117−121. doi: 10.1016/0025-5416(77)90115-X
[8]	Zhang Yongjun, Zhu Chen, Wang Lifeng, et al. Role of tin for enhancing cutting characteristic of the free cutting steel[J]. Heat Treatment of Metals, 2006,31(1):27−29. (张永军, 朱辰, 王立峰, 等. 锡对提高材料切削性能作用的研究[J]. 金属热处理, 2006,31(1):27−29. doi: 10.3969/j.issn.0254-6051.2006.01.008
[9]	Matsui N, Hasegawa T, Fujiwara J. Effect of sulfide inclusion morphology on machinability and tool wear mechanism in low carbon free cutting steel[J]. Journal of the Japan Society for Precision Engineering, 2011,77:322−326.
[10]	Li Hongsheng, Gao Hui. Form of manganese sulphide contained in steel and influences upon steel property[J]. CFHI Technology, 2004,(4):26−28. (李洪生, 高辉. 钢中硫化锰的形态及对钢性能的影响[J]. 一重技术, 2004,(4):26−28. doi: 10.3969/j.issn.1673-3355.2004.04.011
[11]	Ding Yi, Qian Fa, Chen Gang. Failure analysis on fatigue of electric motor shaft[J]. Heat Treatment of Metals, 2001,(12):52−53. (丁毅, 钱发, 陈刚. 电机轴疲劳断裂失效分析[J]. 金属热处理, 2001,(12):52−53.
[12]	Zhang Shuo, Yang Shufeng, Li Jingshe, et al. Morphology of MnS inclusions in Y15 high sulfur free-cutting steel by tellurium treatment[J]. Iron and Steel, 2017,(9):28−33. (张硕, 杨树峰, 李京社, 等. 碲处理控制Y15易切削钢中MnS夹杂物形貌[J]. 钢铁, 2017,(9):28−33.
[13]	Katayama S. Effect of tool materials on surface machined roughness and cutting force of low-carbon resulfurized free-machining steels[J]. ISIJ International, 2007,30(4):331−337.
[14]	Lang Yuping, Chen Haitao, Weng Yuqing, et al. Applications of thermo-calc in research of high nitrogen austenitic stainless steels[J]. Journal of Materials Engineering, 2013,(5):16−22. (郎宇平, 陈海涛, 翁宇庆, 等. 热力学计算在高氮奥氏体不锈钢研究中的应用[J]. 材料工程, 2013,(5):16−22. doi: 10.3969/j.issn.1001-4381.2013.05.004
[15]	Liu Feng, Wang Tianle. Precipitation modeling via the synergy of thermodynamics and kinetics[J]. Acta Metallurgica Sinica, 2021,57(1):55−70. (刘峰, 王天乐. 基于热力学和动力学协同的析出相模拟[J]. 金属学报, 2021,57(1):55−70. doi: 10.11900/0412.1961.2020.00413
[16]	Bale C W, Belisle E, Chartrand P, et al. FactSage thermochemical software and databases[J]. Calphad, 2002,26(2):189−220. doi: 10.1016/S0364-5916(02)00035-4
[17]	Deng Zhenqiang, Liu Jianhua, He Yang, et al. Phase transformations and precipitation behavior in FeCrAl stainless steel during equilibrium solidification[J]. Chinese Journal of Engineering, 2017,39(5):71−81. (邓振强, 刘建华, 何杨, 等. FeCrAl不锈钢的平衡凝固相变与析出行为[J]. 工程科学学报, 2017,39(5):71−81.
[18]	崔忠圻, 覃耀春. 金属学与热处理[M]. 北京: 机械工业出版社, 2007. Cui Zhongqi, Qin Yaochun. Metallographic and thermal treatment[M]. Beijing: China Machine Press, 2007.
[19]	Zhu Qiangbin, Li Jie, Deng Xiangyang, et al. Inclusion analysis in magnesium free-cutting steel[J]. Iron Steel Vanadium Titanium, 2021,42(2):179−192. (朱强斌, 李杰, 邓向阳, 等. 镁系易切削钢中夹杂物分析[J]. 钢铁钒钛, 2021,42(2):179−192.
[20]	Ito Y, Matsubara N, Matsubara K. Formation of manganese sulfide in steel[J]. Trans ISIJ, 1981,21(7):477−484. doi: 10.2355/isijinternational1966.21.477
[21]	Ito Y, Yonezawa N, Matsubara K. Formation of manganese sulfide in low carbon steel[J]. Tetsu-to Hagane, 1982,68(10):1569−1577. doi: 10.2355/tetsutohagane1955.68.10_1569
[22]	Liu H, Chen W. Effect of total oxygen content on the machinability of low carbon resulfurized free cutting steel[J]. Steel Research International, 2012,83(12):1172−1179. doi: 10.1002/srin.201200053
[23]	Shao X, Wang X, Jiang M. Effect of heat treatment conditions on shape control of large-sized elongated MnS inclusions in resulfurized free-cutting steels[J]. ISIJ International, 2011,51(12):1995−2001. doi: 10.2355/isijinternational.51.1995
[24]	钟群鹏, 赵子华. 断口学[M]. 北京: 高等教育出版社, 2006: 1-10. Zhong Qunpeng, Zhao Zihua. Fractography[M]. Beijing: High Education Press, 2006: 1-10.
[25]	陈南平, 顾守仁, 沈万慈. 脆断失效分析[M]. 北京: 机械工业出版社, 1993: 151-152. Chen Nanping, Gu Shouren, Shen Wanci. Brittle fracture failure analysis[M]. Beijing: China Machine Press, 1993: 151-152