摘要
采用热力学模拟软件得到了14Cr-15Ni-6Si高硅奥氏体不锈钢平衡态的相组成,利用OM、SEM等方法研究了固溶热处理温度对高硅不锈钢中相的演变规律。结果表明:14Cr-15Ni-6Si高硅不锈钢的平衡态相主要有γ相、δ相、G相、M_(6)C碳化物等。固溶温度高于1180℃时,合金主要由γ相和δ相组成。随着固溶温度的升高δ相含量逐渐增加,可达40%以上。固溶温度低于1050℃时,合金中主要由γ相和G相组成。G相和δ相的存在都会显著恶化高硅不锈钢的热加工性能,导致热加工时材料出现裂纹。14Cr-15Ni-6Si高硅不锈钢管的最佳热加工工艺是热挤压,最佳热变形温度是1050~1180℃。
The phases of 14Cr-15Ni-6Si high silicon austenitic stainless steel in equilibrium state was obtained by thermodynamic simulation software. The effect of solid solution heat treatment temperature on the phase evolution of the high silicon stainless steel was investigated by OM and SEM. The results show that the equilibrium phases of 14Cr-15Ni-6Si high silicon stainless steel are mainly composed of γ phase, δ phase, G phase and M_(6)C carbide. When the solid solution temperature is higher than 1180 ℃, the alloy is mainly composed of γ phase and δ phase. With the solid solution temperature increasing, the content of δ phase increases gradually, which can reach more than 40%. When the solid solution temperature is lower than 1050 ℃, the mainly phases of alloy are γ phase and G phase. The existence of G phase and δ phase will significantly deteriorate the hot working performance of the stainless steel, leading to the appearance of hot working cracks.The best hot working process of 14Cr-15Ni-6Si high silicon stainless steel pipe is hot extrusion, and the optimal hot deformation temperature is 1050-1180 ℃.
作者
王宝顺
沈红英
孙文强
杨晨
佴启亮
苏诚
WANG Baoshun;SHEN Hongying;SUN Wenqiang;YANG Chen;ER Qiliang;SU Cheng(Zhejiang Jiuli Hi-Tech Metals Co.,Ltd.,Huzhou 313028,China;Engineering Research Center of High Performance Nuclear Power Pipe Forming of Zhejiang Province,Huzhou 313028,China)
出处
《热加工工艺》
北大核心
2022年第17期43-46,53,共5页
Hot Working Technology
基金
浙江省重点研发计划项目(2020C01007)。
关键词
高硅奥氏体不锈钢
组织演变
热加工
high silicon austenitic stainless steel
microstructure evolution
hot working
