摘要
采用SEM、EDS和XRD等手段研究了不同固溶处理温度对GH3625合金热挤压管材组织性能的影响。结果表明,1 120℃是合金组织和力学性能的一个转折点。当固溶处理温度为910~1 120℃时,由于晶界处NbC相的钉扎作用,使得晶粒长大缓慢,合金硬度和强度缓慢下降;当固溶温度超过1 120℃时,NbC相大量回溶,钉扎作用减弱或消失,晶粒急剧长大,合金硬度和强度的下降趋势明显增大。随着固溶温度的升高,合金断口中的韧窝变得大而深邃,塑性逐渐提高;当固溶温度超过1 120℃时,拉伸断口基本以韧窝为主。GH3625合金热挤压管材在固溶处理时间为1h时的最佳固溶处理温度为1 120℃。
The influence of solution temperature on microstructure and mechanical properties of GH3625 alloy hot extruded tube were investigated by SEM,EDS,XRD,etc.The results indicated that 1 120℃was a turning point in the microstructure and mechanical properties of alloys.When the solution treatment temperature was between 910℃and 1 120℃,the grain hardness increased and the strength decreased slowly because of the pinning of NbC phase at grain boundary.When the solution temperature exceeded 1 120℃,the NbC phase was dissolved in a large amount,the pinning effect was weakened,the grain size increased rapidly,the hardness and strength of the alloy decreased obviously.With the increasing temperature,the dimples in alloy fractwre became large and deep and the plasticity gradually increased.When the temperature exceeded 1 120℃,there were mainly dimples in tensile fracture.In conclusion,the optimum solution treatment temperature of GH3625 alloy hot extrusion tube is 1 120℃.
作者
丁雨田
马元俊
豆正义
刘建军
高钰璧
孟斌
DING Yutian;MA Yuanjun;DOU Zhengyi;LIU Jianjun;GAO Yubi;MENG Bin(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第8期1311-1317,共7页
Materials Reports
基金
国家自然科学基金(51661019)
甘肃省重大科技专项项目(145RTSA004)
