The Influence of Mn on Hot Workability and Corrosion Behavior of Nickel-Free Austenitic Stainless Steels

• Main Authors: Ching-Lun Cheng, 程景倫
• Other Authors: Dong-Yih Lin
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/76250702218323511728

碩士 === 義守大學 === 材料科學與工程學系碩士班 === 94 === The purpose of the study is to investigate the effect of manganese contents on hot workability and corrosion resistance of nickel-free austenitic stainless steels. This study can be divided in four parts: the influences of manganese contents on (1) the hot workability of nickel-free austenitic stainless steels between 800℃ and 1200℃.(2) the microstructure of nickel-free austenitic stainless steels after hot tensile test.(3) the hardness of nickel-free austenitic stainless steels.(4) the corrosion resistance of nickel-free austenitic stainless steels. According to result of study, there is superior reduction area in nickel-free austenitic stainless steels as manganese additions above 1000℃, but the tensile strength is not clear decreased to contrast with 18Cr8Ni austenitic stainless steels. There is a great quantity of δ-ferrite phase after hot tensile test, and it is decreased with increasing temperature. Manganese contents are distributed equally inδ-ferrite and γ-austenite phase. Manganese additions have a detrimental effect on corrosion resistance, especially in general corrosion and pitting corrosion. The result shows it has obvious erosion after salt spray test and intergranular corrosion test. Hardness is increased with increasing Mn contents in nickel-free austenite, because S.F.E. is decreased by Mn additions. Key words: Nickel-free austenitic stainless steels, Gleeble hot tensile test, δ-ferrite, γ-austenite, Stacking fault energy.