摘要
采用控轧控冷(TMCP)工艺制备了N08825镍基合金/X70(碳含量为0.16%)复合板和N08825镍基合金/700L(碳含量为0.069%)复合板,并对复合板进行了900~1200℃的固溶处理,利用光学显微镜(OM)和扫描电镜(SEM)研究了不同温度固溶处理后复合板界面碳化物形貌和分布、耐蚀性和冲击韧性。结果表明:碳含量降低后,复合板界面的碳化物减少,低温固溶时碳化物充分溶解,复合板已具有较好的耐蚀性和冲击韧性。镍基合金/X70复合板固溶后碳化物腐蚀坑较大,1200℃固溶时腐蚀速率达到最低值,为1.12 mm/a,平均冲击吸收能量降至16.20 J。镍基合金/700L复合板的冲击韧性、耐蚀性均优于镍基合金/X70复合板。镍基合金/700L复合板在1000℃以下固溶时,冲击吸收能量均高于33.00 J,在1000℃以上固溶后,平均腐蚀速率均低于1.00 mm/a,1200℃固溶时,平均冲击吸收能量为26.90 J。故采用低碳基材及低温固溶处理能有效防止复合板的冲击韧性剧烈下降并保证良好的耐蚀性。
N08825 nickel based alloy/X70(carbon content of 0.16%)composite plate and N08825 nickel based alloy/700L(carbon content of 0.069%)composite plate were prepared by thermal mechanical control processing(TMCP)process,and then solution treatment at 900-1200℃for the composite plates were carried out.The morphology and distribution of interface carbides,corrosion resistance and impact toughness of the composite plate after solution treatment at different temperatures were studied by optical microscope(OM)and scanning electron microscopy(SEM).The results show that the carbides at the interface of the composite plate are reduced after the carbon content is reduced,the carbides are fully dissolved after solution treatment at low temperature,and the composite plate has good corrosion resistance and impact toughness.The carbide corrosion pit of the nickel based alloy/X70 composite plate is large after solution treatment,the corrosion rate reaches the lowest value at 1200℃,which is 1.12 mm/a,and the average impact absorbed energy is reduced to 16.20 J.The impact toughness and corrosion resistance of the nickel based alloy/700L composite plate are better than those of the nickel based alloy/X70 composite plate.The impact absorbed energy of the nickel based alloy/700L composite plate after solution treatment at below 1000℃is higher than 33.00 J,after solution treatment at above 1000℃,the average corrosion rate is lower than 1.00 mm/a,when the solution temperature is 1200℃,the average impact absorbed energy is 26.90 J.Therefore,the use of low-carbonsubstrate and low-temperature solution treatment can effectively prevent the sharp decline of impact toughness of the composite plate and ensure good corrosion resistance.
作者
胡映
丁文红
明亚飞
吴梦先
雷小玲
李天妹
HU Ying;DING Wen-hong;MING Ya-fei;WU Meng-xian;LEI Xiao-ling;LI Tian-mei(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Wuhan First Metallurgical Steel Structure Co Ltd Research and Development Center,Wuhan 430081,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2022年第1期36-45,共10页
Transactions of Materials and Heat Treatment
基金
湖北省技术创新专项重大项目(2018AA005)。
关键词
镍基复合板
碳含量
冲击韧性
固溶温度
耐蚀性
nickel-based composite plate
carbon content
impact toughness
solution temperature
corrosion resistance
