冷却速率对GH4169合金铸态组织和力学性能的影响  

Effect of Cooling Rate on Microstructure and Mechanical Properties of As-cast GH4169 Alloy

作　　者：曲红霞[1] 寇生中[1] 蒲永亮[1] 郭晓凡[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《铸造技术》2016年第3期481-484,共4页Foundry Technology

基　　金：国家重点基础研究发展计划资助项目(2012CB722800)

摘　　要：通过水冷铜坩埚熔炼吸铸制备了不同直径的GH4169高温合金圆柱试样,采用金相显微镜(OM)和扫描电子显微镜(SEM)及X射线衍射(XRD)等对其凝固组织和析出相进行了分析,研究冷却速率对GH4169合金铸态组织和力学性能的影响规律。结果表明,随着冷却速率的增加,合金二次枝晶臂间距减小,凝固枝晶组织明显细化;Laves相尺寸减小且呈现弥散分布;Nb和Mo元素的偏析减轻;合金硬度和强度提高。The GH4169 superalloy rods with different diameters were prepared by suction casting method in water cooling copper crucible. The microstructure and the precipitation phase of solidification were analyzed by optical microscopy（OM）,scanning electron microscopy（SEM） and X-ray diffraction（XRD）, to study the effect of cooling rate on microstructure and mechanical properties. The results show that, with the increase of cooling rate, the secondary dendrite arm spacing decreases and the dendrite microstructure becomes refined obviously. Laves phase size decreases and distributes diffusely, the segregation of Nb and Mo elements get mitigated and the mechanical properties including hardness and strength are improved.

关 键 词：GH4169高温合金 冷却速率 组织结构 力学性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]