长期时效对不同固溶处理喷射成形FGH100L合金组织中γ'相的影响  

Effect of long term ageing onγ'phase in spray formed FGH100L superalloy settled by different solution treatment

作　　者：彭世清 葛昌纯[1] 田甜 郝志博 赵波 PENG Shi-qing;GE Chang-chun;TIAN Tian;HAO Zhi-bo;ZHAO Bo(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;High Temperature Material Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《粉末冶金技术》2021年第6期483-489,共7页Powder Metallurgy Technology

摘　　要：对喷射成形镍基高温合金FGH100L分别进行亚固溶和过固溶热处理,采用扫描电镜研究了长期时效对合金中γ′相尺寸和形貌的影响。结果表明:亚固溶热处理合金中有四种尺寸的γ′相,在长期时效过程中,一次、二次和大三次γ'相尺寸均有明显增长,小三次γ'相尺寸略有减小,四种γ'相长大规律均不符合Lifshitz,Slyozov和Wagner(LWS)粗化模型。一次γ'相、二次γ'相和大三次γ'相出现相似的分裂现象,二次γ'相在时效500 h后出现不稳定生长现象,合金中无拓扑密排(TCP)相析出。过固溶热处理合金中有三种尺寸的γ′相,在长期时效过程中,一次γ'相尺寸略有增长,二次γ'相和三次γ'相尺寸并没有明显变化,三种γ'相长大规律均不符合LSW粗化模型。一次γ'相和三次γ'相形貌基本不变,二次γ'相处于正在分裂状态,没有完全分裂,合金中无TCP相析出。过固溶热处理合金的γ'相尺寸和形貌变化比亚固溶热处理合金小,前者组织稳定性更高。The effects of long term ageing on the size and morphology ofγ'precipitations in the spray formed nickel-based superalloy FGH100L after subsolvs and supersolvs heat treatment(HT)were studied by scanning electron microscope(SEM).The results show that there are four kinds ofγ'phases in the alloys after the subsolvs HT,and during the long term ageing,the sizes of primary,secondary,and large tertiaryγ'phases increase while the size of small tertiaryγ'phase decreases.None of theseγ'phases grow in accordance with the coarsening kinetics as the Lifshitz,Slyozov,and Wagner(LWS)theory during the long term ageing.Apart from the small tertiaryγ'phase,other three kinds ofγ'phases began splitting in a similar way,and the secondaryγ'phase shows the unstable protrusion after ageing for 500 h.No topological close packed(TCP)phase is found in the subsolvs HTed alloys.There are three kinds ofγ'phases in the alloys after the supersolvs HT,and during the long term ageing,the primaryγ'phase grows up slightly while the secondary and tertiaryγ'phases show no obvious change.None of theseγ'phases grow in accordance with the coarsening kinetics as LWS theory during the long term ageing.The morphology of primary and tertiaryγ'phases changes little,and the secondaryγ'phase is splitting at the early stage.No TCP phase is found in the supersolvs HTed alloys.The size and morphology variations ofγ'phases in the supersolvs HTed alloys are smaller than those in the subsolvs HTed alloys,indicating that the former has the better microstructure stability.

关 键 词：镍基高温合金 长期时效 γ'相 喷射成形 固溶处理 

分 类 号：TG156.92[金属学及工艺—热处理]