浇注工艺对K403合金初生碳化物及持久性能的影响  

Effects of Casting Process on Primary Carbide and Stress Rupture Properties of Cast Superalloy K403

作　　者：吴凯西 刘宏萱 彭真 喻石亚 周坚 刘锋[1] Wu Kaixi;Liu Hongxuan;Peng Zhen;Yu Shiya;Zhou Jian;Liu Feng(Powder Metallurgy Research Institute,Central South University;Zhuzhou Zhonghang Power Precision Casting Co.,Ltd.)

机构地区：[1]中南大学粉末冶金研究院 [2]株洲中航动力精密铸造有限公司

出　　处：《特种铸造及有色合金》2019年第1期52-56,共5页Special Casting & Nonferrous Alloys

摘　　要：通过金相显微镜(OM)、扫描电镜(SEM)、能谱(EDX)等试验手段,分析了K403合金返回料在不同浇注温度和造型方式中初生碳化物的形貌、分布及种类,研究了初生碳化物对合金高温持久性能的影响。结果表明,在K403合金中主要为初生MC型碳化物。浇注温度对合金的初生MC型碳化物和持久性能无明显影响。当冷却速率较慢时,初生MC型碳化物主要为较大尺寸长杆状且分布较为集中,降低了合金的高温持久性能;当冷却速率较快时,初生MC型碳化物主要呈小颗粒状弥散分布,对高温持久性能有利。The morphology,distribution and shapes of the primary carbides in Ni-base superalloys K403 casted by different methods were analyzed by optical microscope(OM),scanning electron microscope(SEM)and energy dispersive X-ray(EDX),and effects of the primary carbides on stress rupture behavior of K403 alloy at high temperatures were investigated.The results indicate that primary carbides in K403 are mainly composed of MC type carbide.The casting temperature can be ignored for effect on the primary carbide and stress rupture behavior.However,the long-rod and large primary carbides are detected in K403 alloy at slow cooling rate,which decreases its stress rupture behavior.In contrast,the enhanced stress rupture behavior is observed in K403 alloy at fast cooling rate as a result of the dispersed fine primary carbides.

关 键 词：高温合金 精密铸造 初生碳化物 持久性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG249.5[金属学及工艺—合金]