铬青铜高温力学性能研究

Mechanical Property of Chromium-bronze at Elevated Temperature

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.