固溶处理对旋压C-276合金超薄管材组织和性能影响  

Microstructure and Properties of Spinning Ultra-Thin Wall C-276 Alloy Tubes with Solution Treatment

作　　者：刘成 刘贤钙 张晓宇[1] 郭胜利[1] 郑弃非[1] 李德富[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心

出　　处：《稀有金属》2018年第1期45-52,共8页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51205028)资助

摘　　要：采用电子背散射衍射（EBSD）研究了固溶温度对旋压C-276合金超薄壁管材再结晶、晶界特征分布的影响；运用拉伸试验机和扫描电子显微镜（SEM）研究了固溶温度对合金力学性能及断口形貌的影响。结果表明：随固溶温度升高，完全再结晶比率上升；固溶温度为900℃时，合金未充分再结晶，完全再结晶比率为65％；固溶温度为1100℃时，完全再结晶比率达到99．4％。固溶温度高于1000℃时晶粒快速长大，固溶温度达1200qc时，平均晶粒尺寸为77．1μm。随固溶温度升高，∑3晶界比率呈增高趋势，固溶温度900℃时，三3晶界所占比率为30．5％，固溶温度升高到1200℃时，∑3晶界比率达到57．1％。固溶温度由900℃升高到1200℃，超薄壁管材室温抗拉强度R10从1256MPa降低到745MPa，屈服强度Rp0.2从915MPa降低到340MPa，伸长率A11.3从17．5％上升到65．5％。The effect of solution temperature on microstructure and mechanical properties of spinning uhra-thin wall C-276 alloy tubes was investigated by electron backscatter diffraction （EBSD）, scanning electron microscope （SEM） and tensile tests. Results showed that recrystallization ratio increased with solution temperature increasing. The recrystallization ratio of sample increased from 65.0% to 99.4% with solution temperature increasing from 900 to 1100 ~C. The grain of sample grew up quickly when solution temperature ex- ceeded 1000 ~C. The average grain size of the alloy was 77.1 p.m after solution treatment at 1200 ~C. The results also revealed that in- creasing solution temperature led to an increase in the proportion of E3 grain boundary of sample. With solution temperature increasing from 900 to 1200 ~C, the proportion of E3 grain boundary of sample increased from 30.5% to 57.1%. Furthermore, with solution temperature increasing from 900 to 1200 ~C, the room temperature tensile strength Rm decreased from 1256 to 745 MPa, the yield strength R,~.2 decreased from 1256 to 745 MPa, and elongation Alj.3 increased from 17.5% to 65.5%.

关 键 词：C-276合金 固溶处理 EBSD 晶界特征分布 力学性能 

分 类 号：TG166.7[金属学及工艺—热处理]