摘要
用高温短时拉伸试验分析了LD10合金的高温力学性能,同时还利用扫描电镜分析了每个温度拉伸试样断口的显微组织和断口形貌。结果表明:LD10的高温强度在470℃前遵循常规的温度强度关系,即温度升高,强度降低;塑性指标在470℃之前随着温度的升高而增大,但在500℃左右材料的塑性大幅度下降。各温度点的显微组织表现为α相基体中分布着较多椭圆形相和多角块状相,不同温度点这些相的形状、大小和数量不同。断口的宏观特征表现为韧性断裂和脆性断裂特征共存的现象。
High temperature mechanical properties of LD10 alloy were studied by means of high temperature tensile testing. And the microstructrue and fractography of short term high temperature tensile specimens were analyzed by SEM. It was found that high temperature strength gradually decreases when the temperature increases, but the ductility increases when the temperature increases between 25℃ and 470℃, and at about 500℃ the ductility has low values. The microstructure of different temperature tensile specimens is different. There is a great deal of elliptic and polygonal phases in the α phase, but these phases have different shape, size and quantity at different temperature. It was proved that the fractography of LD10 alloy is characterized by ductile fracture and brittle fracture.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第3期28-30,共3页
Materials For Mechanical Engineering
