Abstract：High temperature properties have been key properties as the work temperature of ferritic stainless steels used at hot end of automotive exhaust system increases. The effect on microstructure and high temperature strength of Nb content for 17%Cr ferritic stainless steel were studied. The strengthen effect of Nb was not obvious for low Nb content (0.2 wt.%) stainless steel and grain size increased quickly at 950℃. When the steels with 0.4 wt.% Nb content were aged at 950℃, second phase Fe2Nb particles precipitated at grain boundary or inside blocked grain growth, improved high temperature strength. The high temperature strength is affected by solutionizing Nb and Nb precipitations. The change of high temperature strengt is induced by the competition between strength decrease caused by drecrease of solutionizing Nb and strength increase caused by Nb precipitating.
谷宇 孙铭山 范光伟. 铌含量对17%Cr超纯铁素体不锈钢组织与高温强度的影响[J]. 钢铁, 2011, 46(1): 70-70.
Mingshan Sun Guangwei Fan. The Effect on Microstructure and High Temperature Strength of Nb Content for 17%Cr Ferritic Stainless Steel. Iron and Steel, 2011, 46(1): 70-70.
2011, Vol. 46 
