摘要
基于10%草酸电解腐蚀特性及硬度测试结果,研究确定了超低铁Inconel 625合金的热处理工艺,利用金相显微镜和扫描电镜观察组织及腐蚀形貌。结果表明：随着固溶温度的提高及保温时间的延长,合金第二相逐渐溶入Ni基体,1140℃保温4 h第二相溶解充分,晶粒分布均匀,未发生快速长大,合金硬度为172 HV10,腐蚀倾向小,质量损失速率为4.97 kg·（m^2·h）^（-1）。固溶处理合金经1000℃稳定化6 h,基体上分布着MC和M_6C两种形式的碳化物,颗粒尺寸细小,合金硬度提高至186 HV10,750℃保温处理10 h后,质量损失速率为4.89 kg·（m^2·h）^（-1）。确定超低铁Inconel 625合金的最佳热处理工艺为：1140℃×4 h固溶＋1000℃×6 h稳定化,合金可获得良好耐蚀性,适宜的硬度及晶粒尺寸。
The optimum heat treatment process of an ultra-low iron content Inconel 625 alloy was studied based on the results of oxalic acid electrolysis evaluation method for corrosion tendency and hardness test results.The microstructure and corrosion products were observed by means of metallographic microscope and the scanning electron microscope（SEM）.The results show that with the increase of the solution treatment temperature and the soaking time,the second phase of the alloy gradually dissolves into the Ni matrix.As the specimens are heated to 1140℃for 4 h,the second phases dissolve fully without rapid grain coarsening,and hardness of the alloy decreases to 172 HV10.Furthermore,the corrosion tendency is low and the weight-loss rate is up to 4.97 kg·（m^2·h）^（-1）.After solution treatment,the specimens is stabilization treated,the fine MC and M_6C carbides precipitates and the hardness increases to 186 HV10 when treated at 1000℃for 6 h.The weight-loss rate is up to 4.89 kg·（m^2·h）^（-1）of the stabilized specimen with 750℃×10 h treatment.The optimum heat treatment process of the ultra-low iron Inconel 625 alloy is to solution treat at 1140℃for 4 h and stabilize at 1000℃for 6 h,which makes the alloy show good corrosion resistance and suitable hardness.
作者
蔡远飞
隋毅
朱治愿
戴安伦
徐玲利
邵兴明
刘威
Cai Yuanfei;Sui Yi;Zhu Zhiyuan;Dai Anlun;Xu Lingli;Shao Xingming;Liu Wei(Provincial Key Lab of Advanced Welding Technology,School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China;Jianesu Xinhua Alloy Electric Ca._ Ltd..Xin~hna ｜inn~ml 225722 China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第9期175-181,共7页
Heat Treatment of Metals
基金
江苏省重点研发计划项目(BE2015145)
