Thermoplasticity of high silicon austenitic stainless steel

HU Yong1,2,WANG Lihua1,2,OUYANG Minghui3,HU Yongqi1,CHU Cheng1

Journal of Iron and Steel Research ›› 2024, Vol. 36 ›› Issue (1) : 108-120.

Journal of Iron and Steel Research ›› 2024, Vol. 36 ›› Issue (1) : 108-120. DOI: 10.13228/j.boyuan.issn1001-0963.20230042
Materials Research

Thermoplasticity of high silicon austenitic stainless steel

  • HU Yong,WANG Lihua,OUYANG Minghui,HU Yongqi,CHU Cheng
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Abstract

Abstract: High temperature tensile and compression experiments on high silicon austenitic stainless steel with different solidification modes and microstructure characteristics were adopted using the Gleeble3500 thermal simulation machine. The JMatPro software, OM(optical microscope), SEM/EDS(scanning electron microscope/energy dispersive spectrometer) and EPMA(electron probe),were used to studied the thermoplastic variation of high silicon austenitic stainless steel. The results show that the ascast 6.0 wt.% Si samples solidified in FA mode (with ferrite as the first precipitated phase) have the worst thermoplasticity, due to the existence of precipitated phase and Weistierlike structure. After homogenization at 1150℃×12h, the solo austenitic structure of 6.0 wt.% Si samples was formed with the section shrinkage reached 76% and elongation 13%. The tensile fracture shows the ductile fracture characteristics and the thermoplasticity were significantly improved. After the 6.0 wt.% Si sample was homogenized at 1200℃×12h, a large amount of high temperature δ ferrite precipitates again, and the thermoplasticity decreases significantly as well the fracture took on the characteristics of intergranular fracture. Combined with hot compression experiments, DRX (dynamic recrystallization) is favored when a moderate amount of elliptical hightemperature δ ferrite is present in the 6.0 wt.% Si specimen.

Key words

Key words:high silicon austenitic stainless steel / δ ferrite / homogenization treatment / thermoplasticity / secondary precipitation

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HU Yong1,2,WANG Lihua1,2,OUYANG Minghui3,HU Yongqi1,CHU Cheng1. Thermoplasticity of high silicon austenitic stainless steel[J]. Journal of Iron and Steel Research, 2024, 36(1): 108-120 https://doi.org/10.13228/j.boyuan.issn1001-0963.20230042

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