超纯铁素体不锈钢热疲劳性能的研究  

A Study on Thermal-Fatigue Behavior of Super Ferrite Stainless Steels

作　　者：谷宇[1] 张晶晶[2] 张保亮[2] 

机构地区：[1]山西太钢不锈钢股份有限公司炼钢二厂,太原030003 [2]山西太钢不锈钢股份有限公司技术中心,太原030003

出　　处：《特殊钢》2014年第1期65-67,共3页Special Steel

基　　金：山西省自然科学基金资助项目(2011011025-4)

摘　　要：研究了预处理铁水-90 t K OBM S-VOD-LF-板坯CC流程生产的1.5 mm冷轧超纯铁素体不锈钢409、429和441板材室温-1 000℃800次循环的热疲劳性能。结果表明,429钢(/%:0.009C,0.86Si,15.3Cr,0.47Nb)和441钢(/%:0.008C,0.45Si,17.9Cr,0.39Nb,0.18Ti)的热疲劳(800次循环的裂纹长度1.2 mm)明显优于409钢(/%:0.007C,0.40Si,11.2Cr,0.14Nb,0.10Ti)的热疲劳(800次循环的裂纹长度2.0 mm);在室温-1 000℃的冷热交替过程中钢的薄弱部位Fe元素会首先形成氧化物并剥落,从而产生裂纹。裂纹附近表面形成Fe_2SiO_4·Cr_2O_3复合氧化膜,阻碍裂纹进一步扩展。The thermal-fatigue behavior with 800 cycles of ambient-1 000 ℃ for 1.5 mm cold-rolled sheet of 409,429 and 441 super ferrite stainless steels produced by pre-treaded metal-90 t K OBM S-VOD-LF-slab CC flow sheet for auto ex- haust pipeline has been studied. Results show that the thermal-fatigue （crack length with 800 cycles- 1.2ram） of steel 429 （/% ： 0. 009C, 0. 86Si, 15.3Cr, 0.47Nb） and steel 441 （/% ： 0. 008C, 0.45Si, 17. 9Cr, 0. 39Nb, 0. 18Ti） is better than the thermal-fatigue （crack length with 800 cycles- 2. 0 ram） of steel 409 （/% ： 0. 007C, 0. 40Si, 11.2Cr, 0. 14Nb, 0. 10Ti ） ; during reversing ambient-1 000 ℃ heating-cooling process, the Fe atoms in weak region of steel are first oxidized to form oxides and peel off from base metal, led to form crack, and the formed Fe2SiO4 Cr2O3 oxide films near crack pre- vent crack further developing.

关 键 词：汽车排气管 409、429和441 超纯铁素体不锈钢 室温-1 000℃热疲劳 

分 类 号：TF764.1[冶金工程—钢铁冶金]