摘要
本工作在常温下对定向凝固镍基高温合金DZ125进行表面低塑性加工(熨压),并研究其高温抗氧化性能。通过微观组织分析发现,DZ125经过低塑性加工后,表面层微观组织由原始柱状晶转变为纳米晶,平均晶粒尺寸约10 nm。研究DZ125在950℃时的恒温氧化性能发现,低塑性加工样品表面氧化物主要为氧化铝(Al2O3)。高温下Al2O3稳定性优于氧化铬(Cr2O3),对材料的高温抗氧化性能产生正面效应,获得的氧化膜相对致密且均匀,氧化动力学曲线呈现抛物线规律。通过EDS分析试样横截面,固溶态及低塑性加工态的DZ125出现了不同程度的内氧化,低塑性加工状态下,氧化层较厚且明显。
In this work,the low-plasticity burnishing( LPB) was employed to study the high temperature oxidation properties of the directionally solidified nickel-based superalloy DZ125. Microstructure analysis revealed that after the LPB process the microstructure of the surface layer changed from pristine columnar crystal to nanocrystalline,with an average grain size of about 10 nm. The surface oxide of LPB samples after high-temperature oxidation at 950 ℃ was mainly alumina( Al2O3),which has better oxidation resistance than chromium oxide( Cr2O3). The oxide film obtained by LPB is relatively dense and uniform. Furthermore,analysis of the cross section of the specimen by EDS reveals that the LPB sample shows obvious internal-oxidation,with thicker oxide layer.
作者
马文彬
郭京京
骆红云
唐君
杨晓光
MA Wenbin;GUO Jingjing;LUO Hongyun;TANG Jun;YANG Xiaoguang(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第10期10093-10097,共5页
Materials Reports
基金
国家重点研发计划(2016YFF0203301)。
关键词
定向凝固
镍基合金
DZ125
低塑性加工
高温氧化
directionally solidification
nickel-based superalloy
DZ125
low-plasticity burnishing(LPB)
high-temperature oxidation
