长期时效对镍基合金的组织及高温拉伸性能的影响  

Effect of the Long-term Aging on Microstructures and High Temperature Tensile Properties of a Ni-Based Superalloy

作　　者：崔彤[1] 王继杰[2] 俞肇元[1] 王磊[1] 杨洪才[1] 赵光普[3] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110006 [2]沈阳航空工业学院材料工程系,辽宁沈阳110034 [3]北京钢铁研究总院,北京100081

出　　处：《金属热处理》2006年第8期49-52,共4页Heat Treatment of Metals

基　　金：国家"十五"科技攻关项目(治No.0050390B);辽宁省博士启动基金项目(20051010);辽宁省航空专项基金项目(2005400607)

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 γ'相 拓扑密排(TCP)相 

分 类 号：TG132.3[一般工业技术—材料科学与工程]