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机械合金化制备304不锈钢显微组织与性能研究
Study on Microstructure and Properties of 304 Stainless Steel Prepared by Mechanical Alloying,HIP and Solid Solution Heat Treatment
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- DOI:
- 作者:
- 党晓凤 李尧 席生岐 孙崇峰
DANG Xiaofeng;LI Yao;XI Shengqi;SUN Chongfeng
- 作者单位:
- 西安交通大学材料科学与工程学院 长安大学材料科学与工程学院
School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China;School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China
- 关键词:
- 机械合金化 奥氏体不锈钢 纳米晶 点蚀
mechanical alloying austenite stainless steels nanocrystals pit corrosion
- 摘要:
- 通过机械合金化制备了304不锈钢粉末并在高温高压下烧结成块,对比研究了块材在固溶热处理前后的力学性能和耐腐蚀性能演化。结果表明,经过8 h棒磨之后的Fe、Cr、Ni混合粉末实现固溶并获得BCC亚稳结构,经过烧结后发生BCC向FCC转变,最终获得接近FCC单相的纳米晶结构;由于细晶强化作用,抗拉强度高达900MPa左右。经过固溶处理后,机械合金化的304不锈钢的抗点蚀性能大幅度提高,超过了标准304不锈钢。
The 304 stainless steels powder was prepared by mechanical alloying and sintered into blocks under high temperature and high pressure.The evolution of mechanical properties and corrosion resistance before and after solid solution heat treatment was studied.The results show that after 8 h bar grinding,Fe,Cr and Ni mixed powder realize solid solution and obtained BCC metastable structure.After sintering,BCC is transformed to FCC,and the nanocrystalline structure close to the single phase of FCC is finally obtained.Due to the strengthening effect of fine grains,the tensile strength is up to about 900 MPa.After solid solution treatment,the pitting resistance of mechanical alloyed 304 stainless steel is greatly improved,which exceed the standard 304 stainless steel.