重复热处理次数对CD3MN双相不锈钢性能的影响

摘要

Reheat-treated times more than 2 are not allowed according to many material standards. Four times reheat-treated tests were done at 1080 ℃ and 1120 ℃ on duplex stainless steel CD3MN, the mechanical properties, microstructure and pit resistance of samples were tested. The results show that after 4 times reheat-treated at the same temperature, mechanical properties and pit resistance of CD3MN have no significant difference; when the temperature increased from 1080 ℃ to 1120 ℃, the content of ferrite increased from 30%to 45%, and mechanical properties and pit resistance were slightly improved.%多个标准中规定材料的重复热处理数不得超过两次.对CD3MN双相不锈钢在1080℃ 及1120℃ 分别进行了4次重复固溶处理试验,检测试块的力学性能、金相组织、耐点腐蚀性能.结果表明:CD3MN双相不锈钢在同一温度下经过4次固溶处理后,力学性能变化不大,均满足标准要求;耐点腐蚀性能变化不大;固溶处理温度从1080℃ 升高到1120℃,铁素体含量从30%提高到45%,力学性能和耐点蚀性能略有提高.