铸型搅动细晶铸造对K492M合金向心叶轮组织与拉伸性能的影响  

Effect of Mold Agitation Fine Grain Casting on Microstructure and Tensile Properties of K492M Alloy Integral Wheel

作　　者：胡聘聘[1] 盖其东[1] 李相辉[1] 汤鑫[1] 侯学勤[2,3,4] 

机构地区：[1]北京航空材料研究院先进高温结构材料重点实验室,北京100095 [2]北京航空材料研究院航空材料检测与评价北京市重点实验室,北京100095 [3]中航工业失效分析中心,北京100095 [4]材料检测与评价航空科技重点实验室,北京100095

出　　处：《铸造》2016年第11期1045-1050,共6页Foundry

基　　金：国家重点研究计划(2016YFB071405);国家高技术研究与发展计划(Z131100006413005)

摘　　要：采用普通铸造（CC）和铸型搅动细晶铸造（MAFGC）工艺浇注了K492M合金向心叶轮,分别制得了平均晶粒度为ASTM M6级（4.5 mm）和ASTM 1级（0.25 mm）的铸件。研究了MAFGC工艺对K492M合金向心叶轮轮盘组织与力学性能的影响。结果表明：与普通铸造相比,MAFGC工艺有效破碎了枝晶,细化了晶粒和枝晶组织,减小了碳化物的尺寸且使其分布更加均匀,使向心叶轮制件800℃以下的拉伸强度显著提高。800~1 000℃之间时,细晶铸造与普通铸造向心叶轮拉伸性能相当。Integral wheels with grain size ASTM M6（4.5 mm） and ASTM 1 （0.25 rnm） were separately prepared by conventional casting （CC）and mold agitation fine grain casting （MAFGC）. The effects of MAFGC on microstructure and tensile property of K492M alloy integral wheel were investigated. The results show that compared with CC, dendrite was tore obviously by MAFGC during solidification, thus, grain size and dendrite space became smaller, and the MC carbide was minimized and dispersed evenly. As a result, tensile property of integral wheel at 800 ℃ was improved. Tensile property of the integral wheel by CC and MAFGC was similar at 800-1 000 ℃.

关 键 词：K492M合金 细晶铸造 显微组织 碳化物 拉伸性能 

分 类 号：V263.1[航空宇航科学与技术—航空宇航制造工程]