金属型离心铸造Ti-48%Al-2%Cr-2%Nb合金汽车排气阀的研制  

Research on Ti-48%Al-2%Cr-2%Nb Automobile Exhaust Valve Cast by Centrifugal Casting Process in Permanent Mold

作　　者：盛文斌[1] 李东[1] 杨锐[1] 郭景杰[2] 刘羽寅[1] 苏彦庆[2] 贾均[2] 

机构地区：[1]中国科学院金属研究所钛合金研究室,辽宁沈阳110015 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《铸造》2001年第3期129-133,共5页Foundry

摘　　要：本文利用离心铸造的方法 ,在金属型中浇铸了Ti 48%Al 2 %Cr 2 %Nb合金汽车排气阀 ,通过SEM、XRD和EMPA等分析手段 ,对排气阀坯件的表面层结构、组织形态、成分分布和力学性能等特征进行了检测 ,并将热等静压(HIP)处理后的排气阀安装到 483Q型柴油发动机上进行了台架试验。结果表明 ,金属型离心浇铸Ti Al基合金排气阀 ,在保证阀体成分均匀性的同时 ,可在一定程度上细化铸件的显微组织。HIP处理后排气阀的平均力学性能为 :σb=670MPa ,σ0 2　 =5 2 7 5MPa和δ =3 %。进一步的台架测试结果表明 ,排气阀在测试过程中表现出了优异的密封性和耐磨性 。In this paper, Ti 48Al 2Cr 2Nb automobile exhaust valve was cast by the centrifugal casting method in permanent mold and its surface layer structure, microstructure, element distribution , mechanical properties etc were analyzed by SEM, XRD and EMPA . Furthermore, the valves treated by HIP were tested on 483Q diesel engine platform. Results showed that the distribution of alloying elements in Ti Al based alloy for exhaust valve was uniform and its microstructure was refined to a certain extent. The mechanical properties of exhaust valve cast by centrifugal permanent mold then treated by HIP were that the σ b = 670MPa, σ 0 2 =527 5MPa and δ=3%. Result of the engine platform test showed that the valve had excellent air tightness and wear resistant properties, so could successfully satisfy requirements of the engine.

关 键 词：TI-AL基合金 离心铸造 金属型铸造 排气阀 汽车 

分 类 号：TG249.4[金属学及工艺—铸造]