一种含Re/Ru镍基单晶合金的蠕变行为及其机理  

Creep Behavior and Mechanism of a Re/Ru-containing Nickel-based Single Crystal Superalloy

作　　者：田淞文 刘丽荣[2] 田素贵[2] TIAN Songwen;LIU Lirong;TIAN Sugui(Shenyang 3D-Dowell Science&Technology Co.Ltd.,Shenyang 110270,China;Department of Materials,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳三迪度维科技开发有限公司,沈阳110270 [2]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《材料研究学报》2024年第4期248-256,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51271125)。

摘　　要：针对含Re/Ru单晶合金共晶组织中的高熔点元素和高推重比发动机材料的高承温能力等问题,研究了固溶温度和组织演化对其高温蠕变行为的影响。结果表明,在1328℃固溶处理的合金中仍存在粒状残余共晶,在1332℃固溶处理可将其消除,使合金在1100℃/140 MPa的蠕变寿命由321 h延长到476 h。在蠕变初期的合金中γ′相转变为N-型筏状组织,在蠕变后期位错剪切进入γ′相形成的位错锁,可抑制位错运动,使合金的蠕变抗力提高。但是高应变速率下位错的交替滑移使筏状γ′相扭折和形成亚晶,可降低合金的蠕变抗力,特别是筏状γ′相转变成“类块状”形态的逆向组织演化提高了应变速率,是合金高温蠕变较后期间的变形和损伤特征。其中,合金在1140℃寿命的大幅度降低,归因于γ′相的溶解使其尺寸减小和体积分数降低。The effect of solution temperature and the relevant microstructure evolution on the creep behavior of a Re/Ru-containing nickel-based single crystal alloy was assessed,aiming to reveal the effect of the addition of high metlting point elements on the performance of the alloy.The results show that the residual eutectic is still persisted in the inter-dendritic region of the alloy after solution treated at 1328oC;after the residual eutectic was eliminated by solution treated at 1332oC,the creep lifetime of alloy may be enhanced from 321 h to 476 h at 1100oC/140 MPa.Theγ′phase in the alloy was changed into rafted structure in the primary period of creep.In the late creep period,although the formed dislocation locks inγ′rafts may impede the dislocations movement to enhance the creep resistance of the alloy,the alternated gliding of dislocations causes the tortuosity ofγ/γ′rafts to form sub-grains,which in turn may reduce the strength and creep resistance of the alloy.Especially,the reversed microstructure evolution of the raftedγ′phase transformed into the block-like configuration may accelerate the strain rate of the alloy until fracture,which is thought to be the deformed and damaged features of the alloy in the later creep period.While the cause of the creep lifetime at 1140oC being decreased to a great extent is attributed to theγ′phase dissolved to diminish its size and volume fraction.

关 键 词：金属材料 镍基单晶合金 Re/Ru 固溶温度 蠕变损伤 逆向组织演化 

分 类 号：TG132.3[一般工业技术—材料科学与工程]