Effect of heat treatment process on manganese sulfide inclusions in resulfurized free-cutting stainless steel

doi:10.13251/j.issn.0254-6051.2020.10.013

Abstract

Abstract: Effect of heat treatment process on the morphology, length-width ratio, size and number of manganese sulfide in resulfurized free-cutting stainless steel was studied by means of OM and SEM-EDS. The results demonstrate that the manganese sulfide in the tested steel is mainly distributed in chain or network along the grain boundary. At the temperatures ranging from 900 ℃ to 1100 ℃, with the increase of temperature, the manganese sulfide is fused and broken. After 1200 ℃ heat treatment, the manganese sulfide matures and grows up, the globular and spindle-shaped manganese sulfide increases and the distribution changes from aggregation to dispersion. During the heat treatment at 1100 ℃ for 1-3 h, with the increase of time, the manganese sulfide is fused and breaks. After heat treatment for 4 h, the manganese sulfide matures and grows up and the globular and spindle-shaped manganese sulfide increases. The manganese sulfide gradually changs from aggregation to dispersion and the distribution tends to be uniform. The appropriate heat treatment process can improve the morphology, length-width ratio, size and number of manganese sulfide in resulfurized free-cutting stainless steel.

Key words: heat treatment, sulfur containing free-cutting stainless steel, Thermo-calc software, manganese sulfide, length-width ratio

CLC Number:

TG156.1

Wang Yinghu. Effect of heat treatment process on manganese sulfide inclusions in resulfurized free-cutting stainless steel[J]. Heat Treatment of Metals, 2020, 45(10): 64-69.

References

[1]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.
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.
[2]陈宣宇, 曹建春, 周晓龙, 等. 国内外易切削钢的研究进展及展望[J]. 热加工工艺, 2016, 45(24): 25-28.
Chen Xuanyu, Cao Jianchun, Zhou Xiaolong, et al. Research progress and prospects of free cutting steel in China and abroad[J]. Hot Working Technology, 2016, 45(24): 25-28.
[3]Valdez M E, Wang Y, Sridhar S. In-situ observation of the formation of MnS during solidification of high sulphur steels[J]. Steel Research International, 2004, 75(4): 247-256.
[4]吴华杰, 岳峰, 尤大利, 等. Mn/S对含硫非调质钢中硫化物形态的影响[J]. 北京科技大学学报, 2014, 36(S1): 77-82.
Wu Huajie, Yue Feng, You Dali, et al. Effect of Mn/S on sulfide inclusions in non-quenched and tempered steel containing sulfur[J]. Journal of University of Science and Technology Beijing, 2014, 36(S1): 77-82.
[5]Sun W P, Militzer M, Jonas J J. Strain-induced nucleation of MnS in electrical steels[J]. Metallurgical Transactions A, 1992, 23(3): 821-830.
[6]尉文超, 薛彦均, 孙挺, 等. 退火温度对V-Ti-Mo钢析出相和力学性能的影响[J]. 金属热处理, 2020, 45(3): 20-24.
Yu Wenchao, Xue Yanjun, Sun Ting, et al. Effect of annealing temperature on precipitate and mechanical properties of V-Ti-Mo steel[J]. Heat Treatment of Metals, 2020, 45(3): 20-24.
[7]王润勋, 王宝峰, 李岩, 等. 0.2C-5Mn-1.5Al中锰TRIP钢的显微组织及力学性能[J]. 金属热处理, 2020, 45(4): 63-68.
Wang Runxun, Wang Baofeng, Li Yan, et al. Microstructure and mechanical properties of 0.2C-5Mn-1.5Al medium manganese TRIP steel[J]. Heat Treatment of Metals, 2020, 45(4): 63-68.
[8]Ito Y, Yonezawa N, Matsubara K. Formation of manganese sulfide in low carbon steel[J]. Tetsu-to Hagane, 1982, 68(10): 1569-1577.
[9]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.
[10]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.
[11]陈列, 陈伟庆, 肖飞虎. Y15高硫易切削钢氧含量与硫化物形态控制工艺[J]. 特殊钢, 2008, 29(4): 55-56.
Chen Lie, Chen Weiqing, Xiao Feihu. Technology of control of oxygen content and sulfide morphology high sulfur free cutting steel Y15[J]. Special Steel, 2008, 29(4): 55-56.
[12]邵肖静, 王新华, 王万军, 等. 硫化锰夹杂物在YF45MnV钢中行为的原位观察[J]. 北京科技大学学报, 2010, 32(5): 570-573.
Shao Xiaojing, Wang Xinhua, Wang Wanjun, et al. In-situ observation of manganese sulfide inclusions in YF45MnV steel[J]. Journal of University of Science and Technology Beijing, 2010, 32(5): 570-573.
[13]雍岐龙. 钢铁材料中的第二相[M]. 北京: 冶金工业出版社, 2006.
[14]Masayuki H, Hiroshi H, Hideo K. Development of lead free micro alloyed steel for crank shafts[J]. Nippon Steel Technical Report, 2003, 88(1): 76-77.
[15]陈俊东, 关晓光, 汪云辉. 热变形工艺对低硫易切削钢中硫化锰形态演变的影响[J]. 金属热处理, 2019, 44(2): 132-137.
Chen Jundong, Guan Xiaoguang, Wang Yunhui. Influence of thermal deformation process on morphology evolution of MnS inclusion in low-sulphur free-cutting steel[J]. Heat Treatment of Metals, 2019, 44(2): 132-137.
[16]伏存田, 夏云进, 王世俊. 热处理工艺对含硫易切削钢中硫化锰夹杂物的影响[J]. 材料热处理学报, 2015, 36(S1): 117-121.
Fu Cuntian, Xia Yunjin, Wang Shijun. Effect of heat treatment process on manganese sulfide inclusions in sulfur containing free-cutting steel[J]. Transactions of Materials and Heat Treatment, 2015, 36(S1): 117-121.