高硅奥氏体不锈钢的热塑性
Thermoplasticity of high silicon austenitic stainless steel
胡勇 1王力华 1欧阳明辉 2胡永淇 3褚成3
作者信息
- 1. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州 730050;兰州理工大学温州泵阀工程研究院,浙江永嘉 325105
- 2. 浙江省宣达集团耐腐蚀特种金属材料研究院,浙江永嘉 325105
- 3. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州 730050
- 折叠
摘要
采用Gleeble-3500热模拟机对不同凝固模式和组织特点的高硅奥氏体不锈钢进行高温拉伸和压缩实验,通过JMatPro软件计算、OM(光学显微镜)、SEM/EDS(扫描电镜/能谱分析)、EPMA(电子探针)等方法研究了高硅奥氏体不锈钢的热塑性变化规律.结果表明:以FA模式(以铁素体为最先析出相)凝固的6.0％(质量分数,余同)Si铸态试样由于析出相及类魏氏体组织的存在热塑性最差;经过1150 ℃ × 12 h均匀化处理后,6.0％Si试样形成单一奥氏体组织,具有76％的断面收缩率和13％的伸长率,拉伸断口呈现韧性断裂特征,热塑性得到显著改善;当6.0％Si试样经过1200℃×12h均匀化处理后,大量高温δ铁素体会重新析出,热塑性显著下降,断口呈现沿晶断裂特征;结合热压缩实验表明,6.0％Si试样中适量椭圆形高温δ铁素体的存在有利于DRX(动态再结晶)的发生.
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 1 200 ℃ × 12 h,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.
关键词
高硅奥氏体不锈钢/δ铁素体/均匀化处理/热塑性/二次析出Key words
high silicon austenitic stainless steel/δ ferrite/homogenization treatment/thermoplasticity/secondary precipitation引用本文复制引用
基金项目
浙江省基础公益研究计划资助项目(LGG21E010008)
兰州理工大学红柳一流学科建设基金资助项目(CGZH001)
甘肃省教育厅"双一流"科研重点资助项目(GSSYLXM-03)
出版年
2024
NETL
NSTL
维普
万方数据