作　　者： ; ; ; ; ; ;

机构地区： 东北大学材料与冶金学院

出　　处： 《金属热处理》 2006年第8期49-52,共4页

摘　　要： 研究了一种新型镍基合金在750 ℃、800 ℃、850 ℃长期时效过程中的高温拉伸性能与组织变化的关系.利用扫描电子显微镜对合金长期时效过程中的显微组织、高温拉伸断口进行了观察和分析.结果表明,该合金在750～800 ℃时效有针状TCP相析出;在750 ℃时效时,随着时效时间的延长,TCP相的析出量呈增加趋势且尺寸不断长大,当时效温度达到800 ℃后,随时效时间的增加TCP相的析出量先增加后减少,最后消失.另外,在长期时效过程中由于γ＇相析出的数量变化不大,750 ℃高温拉伸强度基本保持不变;合金的塑性与TCP相的析出有关,同时受到γ＇相尺寸及晶界碳化物析出的综合影响.试验合金的750 ℃高温断裂基本呈韧性断裂. The relationship between high-temperature tensile properties and microstructures of a Ni-base alloy aged at temperature of 750℃ ,800℃ and 850℃ for long time was investigated. The microstructures and tensile fractographies were analyzed by means of SEM. The results indicate that some TCP phase harmful to the toughness of Ni-base alloy precipitate at the aging temperature from 750℃ to 800℃, and its quantity and size increase with the increase of aging time at 750℃ ,however at 800℃ ,they increase at the former 1000h and then graduate away. The tensile strength at 750℃ is almost unchanged after aged at high temperature for long time because the quantity of precipitated γ′phase varies little during aging. The behavior of 750℃ tensile rupture of the alloy aged at the given temperatures mainly show toughness rupture according to the results of the test.

关 键 词： 镍基合金 拉伸性能 长期时效 相 拓扑密排 相

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]