不同温度时效Ni-20Cr-18W-1Mo合金晶界偏聚及力学性能研究（英文）  

Grain Boundary Segregation and Mechanical Properties of an Aged Ni-20Cr-18W-1Mo Superalloy at Different Temperatures

作　　者：韩寅奔[1] 薛祥义[1] 张铁邦[1] 胡锐[1] 李金山[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2016年第12期3043-3049,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51171150)

摘　　要：采用扫描电镜（SEM）、透射电镜（TEM）、电子探针（EPMA）和高温力学试验机等手段,研究了不同时效温度（200-800℃）对Ni-20Cr-18W-1Mo高温合金的元素晶界偏聚和力学性能的影响。结果表明,硫、磷元素的晶界偏聚临界时间随时效温度升高而缩短;时效温度对元素在晶界和晶内的成分分布有显著的影响;实验合金的抗拉强度和延伸率随时效温度升高而降低。分析发现,硫、磷元素在晶界中的含量随时效温度升高而增大直至两者分别在650和400℃时达到峰值,是合金在200-600℃区间力学性能降低的重要原因。The influence of aging temperature（200 to 800 °C） on grain boundary segregations in a Ni-20Cr-18W-1Mo superalloy was investigated by scanning electronic microscope（SEM）, transmission electron microscopy（TEM）, electron microprobe analyzer（EMPA） and a mechanical testing machine. Results indicate that the grain boundary segregation critical time of sulfur and phosphorus decreases with increasing of the aging temperature. Increasing of the aging temperature has a conspicuous effect on the concentration distribution in the grain boundary and the grain core. Grain boundary concentrations of sulfur and phosphorus increase with raising the testing temperature until a peak value is obtained at 650 and 400 °C, respectively, which is the essential reason to the declined mechanical properties from 200 to 600 °C.

关 键 词：Ni-20Cr-18W-1Mo高温合金 杂质元素 晶界偏聚 力学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]