摘要
为了研究FGH95合金的相组成及γ'相的粒度分布,采用电解萃取方法提取热处理态FGH95合金中的γ'相,测定γ'相的相组成结构式;通过XRD曲线测定γ'、γ相的晶格常数及错配度,对萃取的合金中γ'相粉末进行小角度衍射,测定出γ'相的粒度分布.结果表明,经1 140℃固溶和时效处理后,合金的组织结构由γ'相(质量分数约为47.8%)、γ相(质量分数约为51.2%)、(Nb,Ti)C、(Nb,W)B2、Nb3B2和Cr23C6等碳、硼化物(质量分数约为1%)组成,γ'相的结构组成式为(Ni0.896Co0.055Cr0.017Fe0.031)3(Ti0.224Nb0.134Al0.473Mo0.038W0.066Cr0.064),其中,在36～60 nm和60～96nm尺寸范围内的γ'相粒子质量分数分别为30.6%和29.1%,且细小γ'相在晶内弥散分布,而粗大γ'相分布于较宽的颗粒边界区域,并进一步测算出合金中γ'、γ两相的晶格常数分别为0.359 86nm和0.359 12 nm,晶格错配度为0.205 8%.
In order to study the phase constituent and granularity distribution of γ′ phase,the γ′ phase in FGH95 nickel based superalloy subjected to heat treatment was extracted by means of an electrolytic extraction method,and the structural formula of γ ′ phase was tested.The lattice parameters and misfit of γ′ and γ phases were measured with XRD curves.Furthermore,the small-angle diffraction for the extracted γ′ phase powder in the superalloy was carried out,and the granularity distribution of γ′ phase was determined.The results show that after solid solution at 1 140 ℃ plus aging treatments,the microstructure of the superalloy consists of γ′ phase（mass fraction of 47.8%）,γ phase（mass fraction of 51.2%）,and carbides and borides（mass fraction of 1%） such as（Nb,Ti）C,（Nb,W）B2,Nb3B2and Cr23C6 phases.The structural formula of γ′ phase is identified as（Ni0.896Co0.055Cr0.017Fe0.031）3（Ti0.224Nb0.134Al0.473Mo0.038W0.066Cr0.064）,and the mass fractions of γ′ phase with granularity ranges of 36 to 60 nm and 60 to 96 nm are 30.6% and 29.1%,respectively.In addition,the fine γ′ phase dispersedly distributes inside the grains,while the coarse γ′ phase discontinuously precipitates along the wider grain boundaries.Moreover,the lattice parameters of γ′ and γ phases are determined as 0.359 86 nm and 0.359 12 nm,respectively.The lattice misfit between γ′ and γ phases is 0.205 8%.
出处
《沈阳工业大学学报》
EI
CAS
2011年第6期635-639,共5页
Journal of Shenyang University of Technology
基金
国家自然科学基金资助项目(50571070)
教育部博士点基金资助项目(20092102110003)
关键词
FGH95镍基合金
γ'相
电解萃取
组织形貌
相分析
晶格常数
错配度
粒度分布
FGH95 nickel based superalloy
γ′ phase
electrolytic extraction
microstructure
phases analysis
lattice parameter
misfit
granularity distribution
