摘要
研究了Inconel783高温合金螺栓的组织结构与织构特点,重点关注β相的分布与析出特征,并研究了高温应力松弛前后组织与织构的变化情况。结果表明,螺栓试样γ相晶粒分布较为均匀,同时存在弥散分布的γ′相析出。大颗粒的β相沿螺栓轴向成串分布,其分布特征与γ相晶粒取向及尺寸无关,主要由冶炼方式与热加工过程决定;较小的β相在γ相晶界与晶内、连续或孤立析出。织构方面,γ相与β相均未表现出强织构,与热加工过程中变化的多向应力状态有关。以螺栓轴向(x方向)为试样参考方向,γ相存在一定的<111>//x与<100>//x择优,其中前者强度稍高。高温应力松弛试验后,γ相组织、β相分布与各相织构均较为稳定。对该合金中发挥重要作用的小尺寸β相分析发现,其析出行为受到γ相基体取向与晶界特征影响,其中<111>取向晶粒内析出较多,孪晶界上β相析出不占优势。因此,通过控制热加工与固溶处理过程中γ晶粒尺寸与取向择优,有望调控其析出特征。
Microstructure and texture of Inconel783 superalloy bolts were studied,andβphase precipitation characteristic was paid special attention,meanwhile the microstructure and texture changes after stress relaxation experiment at high temperature were investigated.The results show that the grain size ofγphase is homogeneous,andγ′precipitates distribute dispersely.Largeβ-phase particles are shown to align regularly,with the longitudinal axis parallel to the axis direction of bolt.The distribution ofβ-phase particles does not depend on theγphase grain orientations and sizes,while it is mainly determined by smelting and hot deformation processes;the smallβ-phase particles precipitate atγphase grain boundaries and inside grains,continuously or separately.Regarding texture,neither theβnorγphase texture is strong,showing the effect of changing multi-directional stress during hot deformation.Using the axis direction of bolt as the sample reference direction x,<111>//x texture with higher intensity and<100>//x texture are observed inγphase.Theγphase microstructure,βphase distribution and the textures of both phases are stable during stress relaxation at high temperature.By analyzing the distribution of essential smallβ-phase particles in Inconel783 superalloy,it is found that the precipitation behavior is influenced by the orientation ofγphase matrix and grain boundary characteristic.More small-sizedβ-phase precipitation occurs in<111>//x orientedγgrains,while the precipitation quantity does not show advantage at twin boundaries.It can be deduced that the precipitation of small-sizedβ-phase particles could be modified by controlling the grain size and texture evolution ofγphase during hot deformation and solution treatment processes.
作者
黄友桥
李望
朱新平
黄一君
张宁
孟利
Huang Youqiao;Li Wang;Zhu Xinping;Huang Yijun;Zhang Ning;Meng Li(Zhejiang Zheneng Lanxi Electric Power Generation Co.,Ltd.,Jinhua Zhejiang 321199,China;Zhejiang Zheneng Technology Research Institute Co.,Ltd.,Hangzhou Zhejiang 311121,China;Metallurgical Technology Institute,Central Iron&Steel Research Institute,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第9期214-219,共6页
Heat Treatment of Metals
基金
浙能集团科技项目(ZNKJ-2019-026)。
