铬青铜高温力学性能研究  

Mechanical Property of Chromium-bronze at Elevated Temperature

作　　者：刘瑞华[1] 宋克兴[1] 贾淑果[1] 郜建新[1] 国秀花[1] 王青[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《铸造技术》2008年第3期338-340,共3页Foundry Technology

基　　金：河南科技大学校基金(2002QN01);河南省高校杰出科研人才创新工程项目(2007KYCX008);河南省教育厅科技攻关项目(2007430004);河南科技大学重大科技前期预研专项(2005ZD003);河南科技大学人才科研基金(of023)

摘　　要：研究了铬青铜的室温至900℃的拉伸性能和微观组织,以及合金在应变速率为0.01s-1时的高温应力-应变关系。结果表明,该材料在900℃时屈强比较低,合金的伸长率与断面收缩率较高,塑性最好。材料的强度随温度的升高而下降。高温应力-应变曲线可分为3个阶段:微应变区,过渡变形区和稳态变形区。铬青铜的高温断裂特征表现为局部韧性断裂。Tensile properties and microstructure of chromium-bronze in the range of room temperature to 900 ℃ were investigated, and the true tensile stress-true strain curve of QOr0.5 at elevated temperatures under tensile strain rate 0.01 s^-1 was studied as well. The results show that the material has the lowest yield strength, the good elongation and contraction of area at 900 ℃, simultaneity, QOr0. 5 has the best plastic deformation. The strength decreases with increasing temperature. Stress-strain curve of the material at elevated temperature pass through three phases： micro-strain, transition deformation and steady-state deformation. The fracture features are locally ductile failure.

关 键 词：铬青铜 高温 拉伸 压缩 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]