Study on Microstructure and Properties of 304 Stainless Steel Prepared by Mechanical Alloying,HIP and Solid Solution Heat Treatment
Author of the article:DANG Xiaofeng;LI Yao;XI Shengqi;SUN Chongfeng
Author's Workplace：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
Key Words：mechanical alloying austenite stainless steels nanocrystals pit corrosion
Abstract：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.
