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.
出处
《科学技术与工程》
北大核心
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
