Modification of sulfide inclusions in 15-5PH steel by tellurium treatment
CHE Zhi-chao1, LIU Wei1, YANG Shu-feng1, LI Jing-she1, LIU Chao2, YUAN Hao1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
Abstract：15-5PH precipitation-hardened stainless steel has excellent machining properties,which can be affected by inclusions in steel significantly. Long strip sulfide inclusions often lead to obvious anisotropy in mechanical properties due to the decrease of transverse performances for sulfur-containing steel during machining,which leads to material fracture failure. In order to investigate the effects of tellurium treatment on morphology,size and aspect ratio of sulfide in 15-5PH steel, high temperature test, SEM-EDS and statistical method were used in the test,and the mechanism of tellurium control on the morphology of manganese sulfide inclusions was discussed. The results show that sulfide of long strip and chain typeⅡin steel are modified into spherical MnS-MnTe and (Al-Si-O)-MnS-MnTe complex inclusions by tellurium treatment. The morphology and distribution of tellurium sulfide inclusions in steel were greatly changed. The aspect ratio of inclusions in steel decreased from 1.83 to 1.49,spheroidization rate was significantly increased,and the modification effect was obvious. When w([Te])/w([S]) in steel was 1.42,the inclusions had lower aspect ratio and smaller size, and the modification effect was the best. When w([Te])/w([S]) in steel was 2.32,large inclusions with high tellurium phase and sulfide embedded in telluride were found in the steel,and the average size of inclusions increased while the modification effect decreased. It indicates that there is an optimal amount of inclusion in tellurium treated steel,and high tellurium sulfide ratio exceeds the certain amount can not further improve the spheroidization rate. The addition of tellurium can significantly spherize sulfide inclusions in steel,reduce the aspect ratio of inclusions, improve the transverse performance and the cutting performance of steel. It can provide more application scenarios and possibilities for sulfide modification in steel,and provide certain reference for field process formulation.
车智超, 刘威, 杨树峰, 李京社, 刘超, 袁昊. 碲处理对15-5PH钢中硫化物夹杂改性的作用[J]. 钢铁, 2022, 57(3): 36-43.
CHE Zhi-chao, LIU Wei, YANG Shu-feng, LI Jing-she, LIU Chao, YUAN Hao. Modification of sulfide inclusions in 15-5PH steel by tellurium treatment[J]. Iron and Steel, 2022, 57(3): 36-43.
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2022, Vol. 57 
