双相不锈钢铸件热处理凹坑与氧化皮产生原因及改善措施  

Causes and Improvement Measures of Pits and Thick Oxide Scale on Duplex Stainless Steel Castings During Heat Treatment

作　　者：马保斌 路琛 苏国宝 MA Bao-bin;LU Chen;SU Guo-bao(Datong Reciprocity Group Co.,Ltd.,Zhangzhou 363999,Fujian,China)

机构地区：[1]福建省大通互惠集团有限公司,福建漳州363999

出　　处：《铸造》2021年第1期99-103,共5页Foundry

摘　　要：某双相不锈钢ASTM A995-5A铸件由于其固溶化热处理温度相对较高(1 140±15)℃,铸件在热处理炉体中长时间保温并随炉缓慢冷却,在热处理后发现铸件氧化较为严重,氧化皮最厚(热节部位)可达到3~4 mm,且铸件表面存在明显的凹坑。通过理论与试验相结合的方式对表面凹坑及氧化皮过厚的成因进行分析,提出在铸件表面刷涂一种高温抗氧化涂料的方案。此方案的应用使铸件在热处理时产生的氧化皮减薄了,且避免了铸件因高温长时间的热处理而导致的Mo元素氧化与挥发而造成的凹坑,并在其后的生产中证明是切实可行的。High solid solution treatment temperature(1 140±15)℃ and a long holding time as well as slow cooling in the furnace, resulted in thick oxide scale 3-4 mm and more pits on the surface of ASTM A995-5 A duplex stainless steel castings after heat treatment. According to analysis on the causes of the surface pits and thick oxide scale occurrence, a high temperature anti-oxidation coating was applied to the casting surface. It was found that this method had a remarkable effect on the reduction of oxide scale thickness and pits on the casting surface in the experiment, and was also feasible in the industrial production.

关 键 词：氧化皮 表面凹坑 抗氧化涂料 双相不锈钢 

分 类 号：TG269[金属学及工艺—铸造]