硅对高硅奥氏体不锈钢析出相的影响  

Effect of Silicon on Precipitates of High-Silicon Austenitic Stainless Steel

作　　者：李潇欢 崔国伟 陈思含 梁田[2,3,4] 邢炜伟 马颖澈 王平[1] 吴进明 李国斌[4] Li Xiaohuan;Cui Guowei;Chen Sihan;Liang Tian;Xing Weiwei;Ma Yingche(Wang Ping1,Wu Jinming3,Li Guobin41Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China;Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang Xindeda Special Pipe Industry Co.,Ltd,Wenzhou 325024,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819 [2]中国科学院金属研究所核材料与安全评价重点实验室,辽宁沈阳110016 [3]浙江大学材料科学与工程学院硅材料国家重点实验室,浙江杭州310027 [4]浙江信得达特种管业有限公司,浙江温州325024

出　　处：《稀有金属材料与工程》2022年第8期2769-2776,共8页Rare Metal Materials and Engineering

基　　金：Postdoctoral Research Funding Project of Zhejiang Province (ZJ2020017)。

摘　　要：采用XRD、TEM和压痕变形等方法研究了Si含量(4%~8%,质量分数)对高硅奥氏体不锈钢(ZeCor)显微组织的影响。结果表明,Si含量的增加会导致ZeCor合金的相组成发生变化:ZeCor-4%Si合金组织为单相奥氏体(γ相),ZeCor-6%Si合金主要含γ相和少量σ相,在ZeCor-8%Si合金中主要析出Cr_(3)Ni_(5)Si_(2)相和少量σ相。此外,Cr_(3)Ni_(5)Si_(2)与σ相相比具有更高的硅、镍含量。显微硬度HV高达7840 MPa的Cr_(3)Ni_(5)Si_(2)相是典型的硬脆相,该相的析出将大大提高ZeCor-8%Si合金中γ基体的显微硬度。ZeCor合金中γ基体的强化机制如下:固溶强化是ZeCor-6%Si合金的主要强化机制,而Si的固溶强化和Cr_(3)Ni_(5)Si_(2)的析出强化机制都大大提高ZeCor-8%Si合金中的γ基体的显微硬度。在ZeCor-8%Si合金中,Cr_(3)Ni_(5)Si_(2)相起显著作用。The effect of silicon contents(4wt%~8wt%)on microstructure of high-silicon austenitic stainless steel ZeCor was investigated by XRD,TEM and indentation deformation.Results show that increasing Si content leads to the phase constitute change of ZeCor alloy:the microstructure is single-phase austenite(γphase)in ZeCor-4wt%Si alloy,γphase with a small quantity ofσ-phase in ZeCor-6wt%Si alloy,and as for the ZeCor-8wt%Si alloy,the main precipitations are Cr_(3)Ni_(5)Si_(2) phase and a bitσ-phases.In addition,the Cr_(3)Ni_(5)Si_(2) phase has a higher silicon and nickel content than theσ-phase.The Cr_(3)Ni_(5)Si_(2) phase with a micro-hardness HV as high as 7840 MPa is a typical hard and brittle phase,and the precipitation of such phase can greatly increase the micro-hardness of theγmatrix in the ZeCor-8wt%Si alloy.The strengthening mechanism ofγmatrix in ZeCor alloy is as follows:the solid solution strengthening is the main strengthening mechanism in ZeCor-6wt%Si alloy,while the solid solution strengthening of Si and the precipitation strengthening of Cr_(3)Ni_(5)Si_(2) greatly increase the micro-hardness of theγmatrix in ZeCor-8wt%Si alloy,and the Cr_(3)Ni_(5)Si_(2) phases have a great effect.

关 键 词：高硅奥氏体不锈钢 硅含量 Σ相 显微硬度测试 Cr_(3)Ni_(5)Si_(2)相 

分 类 号：TG142.71[一般工业技术—材料科学与工程]