固溶冷却方式对一种难变形镍基高温合金显微组织和力学性能的影响  

Effect of cooling method after solution treatment on heat-treated microstructure and mechanical properties of a novel hard-deform Ni-base superalloy

作　　者：王广磊 段然 黄烁 曲敬龙 杜金辉 赵光普 WANG Guanglei;DUAN Ran;HUANG Shuo;QU Jinglong;DU Jinhui;ZHAO Guangpu(Beijing CISRI-GAONA Materials and Technology Co.,Ltd.,Beijing 100081,China;Sichuan CISRI-GAONA Forging Co.,Ltd.,Deyang 618000,Sichuan,China)

机构地区：[1]北京钢研高纳科技股份有限公司,北京100081 [2]四川钢研高纳锻造有限责任公司,四川德阳618000

出　　处：《金属加工（热加工）》2024年第12期71-78,83,共9页MW Metal Forming

基　　金：中国钢研科技集团有限公司青年创新基金资助(KNJT03-JT0M-21023)。

摘　　要：研究了固溶冷却方式(水冷、油冷、空冷)对一种高γ'相含量约为55%(质量分数)镍基变形高温合金热处理组织和力学性能的影响。亚固溶(低于γ'相全溶温度)静态再结晶晶粒均匀细小(10~30μm)。固溶冷却方式对静态再结晶晶界和γ'相数量分布及尺寸产生重要的影响,随着固溶冷却速度降低(水冷>油冷>空冷),一次γ'相和二次γ'相尺寸增加,三次γ'相数量分布减少。室温(23℃)和850℃拉伸强度与二次γ'相分布紧密相关,二次γ'相尺寸越小,抗拉强度越高。再结晶晶界状态和晶粒尺寸在很大程度上决定了850℃拉伸塑性和850℃/350MPa持久性能。晶界一次γ'相和碳化物促使850℃拉伸和持久断口形貌获得沿晶塑性断裂特征。It is investigated that the effect of solid-solution cooling methods on the heat-treated microstructure and resultant mechanical properties of a novel Ni-based wrought superalloy with a high content of(~55%,wt.)ofγ'phase.The obtained microstructure after sub-solvus static recrystallization is uniform and fine with 10~30μm.The solid-solution cooling method has a significant impact on the recrystallized grain boundary and the distribution and size ofγ'precipitates.As the solid-solution cooling rate decreases(water cooling>oil cooling>air cooling),the sizes of primary and secondaryγ'precipitates increase,while the number of tertiaryγ'precipitates decreases.The tensile strengths at room temperature and 850℃are closely related to the distribution ofγ'precipitates,and the smaller the size of secondaryγ'precipitates,the higher the tensile strength.Both the tensile plasticity at 850℃and the stress-rupture property under 850℃/350MPa are largely determined by the recrystallized grain boundary(and the grain size).The intergranular plastic fracture modes can be obtained after tensile and stress-rupture experiments at 850℃with the presence of primaryγ'precipitates and carbides on grain boundaries.

关 键 词：难变形镍基高温合金 固溶冷却方式 热处理组织 力学性能 沿晶塑性断裂 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG156.94[金属学及工艺—合金]