摘要
制备了一种新型13Cr4Ni马氏体不锈钢并研究了热处理对其硬度和耐腐蚀性的影响。不同的热处理工艺试验比较显示,材料达到低硬度和高耐腐蚀性要求的最佳热处理工艺为780℃×6h退火+1040℃×1h空冷淬火+675℃×7h一次回火+605℃×5h二次回火处理。微观结构分析表明,热处理后试验钢的组织为典型的回火马氏体,马氏体晶内有细小弥散的碳化物析出,逆转变奥氏体以膜状形态分布于晶界。在2%NaCl溶液中Tafel极化曲线测试结果显示,试验钢的耐腐蚀性明显优于410不锈钢。
A new stainless steel 13Cr4Ni was prepared and the influence of heat treatment on its hardness and anti-corrosion properties was investigated. The results show that, to achieve the low hardness and improve corrosion resistance, the optimum heat treatment process is 780 ℃ × 6 h annealing ＋ 1040 ℃ × 1 h heating and air cooling ＋ 675 ℃ × 7 h first tempering ＋ 605 ℃ × 5 h secondary tempering. The microstructure analysis results of the tested steel show that the typical microstructure after heat treatment is tempered martersite on which fine dispersive carbides precipitated intergranularly and the film forming reversed austenite distributed along granular boundary. The Tafel polarization curves of the tested steel in 2% NaCl corrosive medium indicate that the anti-corrosion is two times as that of the 410 stainless steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2008年第7期57-61,共5页
Heat Treatment of Metals
