高温均匀化对Nb-Ti-Si-Cr基超高温合金组织和成分分布的影响  

The Effects of Homogenizing Treatment on the Microstructure and Distribution of Chemical Composition of Nb-Ti-Si-Cr Based Ultrahigh Temperature Alloy

作　　者：郭宝会 郭喜平[2] 

机构地区：[1]渭南师范学院数理学院,渭南714099 [2]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《科学技术与工程》2018年第4期251-254,共4页Science Technology and Engineering

基　　金：陕西省科技厅研究项目(2015KW-022);渭南市科技局项目(2015KYJ-2-4);渭南师范学院人才项目(17ZRRC02);陕西省数学重点扶持学科项目;陕西省教育厅专项科学研究计划(17JK0275)资助

摘　　要：研究了不同均匀化温度对Nb-Ti-Si-Cr基超高温合金组织和元素分布的影响;结果发现随着高温均匀化处理温度的升高,硅化物的组织形貌由共晶首先转变为细长条状,随后长大为长条状,Laves相Cr_2Nb的形貌由针状转变为粗大的不规则形貌,最后溶解。随着高温均匀化温度的升高,Ti在初生相Nbss中的含量呈现升高的趋势,而Cr在初生相Nbss中的含量呈现先升高后降低的趋势。The effects of homogenizing temperature on the microstructure and distribution of chemical composition of Nb-Ti-Si-Cr based ultrahigh temperature alloy were investigated. The results show that the previous Nbss/( Nb,X)_5Si_3 eutectic colonies break into small( Nb,X)_5Si_3 strip,then the strip became coarse with increase in heat-treatment temperature. The needle-like Laves Cr_2Nb transform into needle-like Laves become coarse Laves blocks,and the previous Laves Cr2 Nb particles dissolve into Nbss,much finer and crowded Cr_2Nb platelets form during cooling with increase in heat-treatment temperature. Ti concentrations in primary Nbss phase decrease with increase in heat-treatment temperatures,and Cr concentration in primary Nbss phase increase firstly,then decrease with increase in heat-treatment temperatures.

关 键 词：Nb-Ti-Cr-Si基超高温合金 高温均匀化 组织形貌 

分 类 号：TG146.416[一般工业技术—材料科学与工程]