时效+再结晶退火对镍基合金锻造混晶组织的影响  

Effect of Aging and Recrystallization Annealing Treatment on Forged Mixed Grain Structure of Ni-based Superalloy

作　　者：杨志明 陈子健 蔺永诚[2] 楼玉民 黄一君 Yang Zhiming;Chen Zijian;Lin Yongcheng;Lou Yumin;Huang Yijun(Sanmen Nuclear Power Co.,Ltd,Taizhou 472000,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Materials Technology Institute,Zhejiang Zheneng Technology Research Institute Co.,Ltd,Hangzhou 311121,China)

机构地区：[1]三门核电有限公司,浙江台州472000 [2]中南大学机电工程学院,湖南长沙410083 [3]浙江浙能技术研究院有限公司材料技术所,浙江杭州311121

出　　处：《稀有金属材料与工程》2023年第9期3147-3152,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51775564);湖南省科技人才托举工程(2020TJ-Q05)。

摘　　要：为了消减镍基合金锻件中的混晶组织,提出了δ相时效+再结晶退火的热处理工艺路线。δ相在时效过程中可以直接析出或者由γ″相发生相变间接析出。对含析出δ相的材料进行高温再结晶退火,然后立即水冷,可以发现时效方式和时效时间对退火过程中的组织演变存在显著影响。时效过程中直接析出的δ相主要分布在晶界,随着时效时间延长部分晶粒内部也会析出δ相,其形貌以短棒状为主。间接析出的δ相主要分布在晶粒内部以及晶界,其形貌主要为晶内长针状以及晶界短棒状。短棒状δ相在退火过程中与位错交互作用较弱,主要起到钉扎晶界的作用;而长针状δ相能够促使亚晶的形成。因此,间接时效方式有利于再结晶形核的发生,并能够有效阻碍晶粒生长避免异常长大的再结晶晶粒。In order to eliminate the mixed grain structure of forged Ni-based superalloy parts,the heat treatment process ofδphase aging+recrystallization annealing was proposed.During aging,theδphase can be precipitated directly or indirectly by the transformation ofγ″phase.The alloy with precipitatedδphases was annealed at high temperature and then immediately treated by water cooling.It is found that the aging routes and aging times greatly affect the microstructure evolution during recrystallization annealing.In the aging process,the directly-precipitatedδphase is mainly distributed at grain boundaries.With prolonging the aging time,someδphases are precipitated inside the grains,and the main morphology is short-rod-like.The distribution characteristic of the indirectly-precipitatedδphase is mainly intragranular needle-like and intergranular short-rod-like.The short-rodδphase has weak interaction with dislocations during annealing,which leads to the pinning of grain boundaries.Besides,the long-needle-likeδphase can promote the formation of sub-grains.That is why the indirect aging is favorable for the recrystallization nucleation.Additionally,this phenomenon can also effectively hinder the growth of grains to avoid the abnormal growth of recrystallized grains.

关 键 词：镍基合金 退火 析出相 再结晶 

分 类 号：TG146.15[一般工业技术—材料科学与工程]