摘要
采用不同温度对GH3625合金热挤压管材进行热处理,研究了热处理对GH3625合金管材组织演变和性能的影响。结果表明,热处理温度对晶粒长大影响比较明显,随热处理温度升高,晶粒长大温度为970℃到1150℃,当温度达到1180℃时,晶粒迅速长大,同时热处理温度改变雪花状Ni_2(Cr,Mo)相析出和分布。GH3625合金管材的硬度值与晶粒尺寸符合Hall-Patch关系式。随热处理温度升高,GH3625合金抗拉强度降低,断后伸长率增加。热处理前后GH3625合金的断裂均视为韧窝断裂和部分沿晶断裂的混合型。
Hot extrusion pipe of GH3625 alloy was heat-treated at different temperatures,and the effects of heat treatment on its microstructure and properties were investigated. The results show that heat treatment temperature exhibits significant effect on grain growth. With the increasing heat treatment temperature,the grain gradually grows from 970 ℃ to 1150 ℃ and then the grain size fast increases at 1180 ℃,at the same time,the snowflake-shaped Ni_2（ Cr,Mo） phase is gradually dissolved. The relationship of the hardness value and grain size with heat treatment temperature of GH3625 alloy tube follows Hall-Patch relation. The tensile strength of GH3625 alloy decreases,while the percentage elongation increases with increasing temperature. The fracture mechanism of GH3625 alloy before and after heat treatment is a mixed mode of dimple rupture and intergranular fracture.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第12期84-89,共6页
Transactions of Materials and Heat Treatment
基金
甘肃省重大科技专项项目(145RTSA004)
