选用K 18合金和纯金属镍及不同的面层细化料，通过实验对比研究了镍基高温合金叶片表面晶粒细化机理。
Surface grain refinement of turbine blades in Ni based superalloy K18 were studied by comparison of experimental results in different alloys and mold surface materials.
高温合金属于难加工材料，本文对比研究了高温合金样件晶粒度对其加工性能的影响。
Superalloys is a sort of hardly cutting material, the influence of grain refinement to machinability of superalloys was studied through contrasting different grain.
采用氧化法和晶粒边界腐蚀法对几种不同的碳钢和合金钢的奥氏体晶粒的显示进行了对比试验。
Austenite grain size of plain carbon steel and alloy steel were examined by oxidization and grain boundary etching method.
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