冷却方式对K416B合金显微组织和力学性能的影响  

Effect of cooling methods on microstructure and mechanical properties of K416B alloy

作　　者：杨林[1] 朱玉平 盛乃成 于金江[2] 孙晓峰[2] YANG Lin;ZHU Yu-ping;SHENG Nai-cheng;YU Jin-jiang;SUN Xiao-feng(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research of Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所师昌绪先进材料创新研究中心,沈阳110016

出　　处：《沈阳工业大学学报》2023年第2期151-155,共5页Journal of Shenyang University of Technology

基　　金：辽宁省自然科学基金面上项目(2020-MS-014);中科院轻型动力创新研究院创新引导基金项目(CXYJJ-QN-02)。

摘　　要：为了明确K416B合金铸态组织和性能不稳定的原因,通过不同冷却方式制备了K416B合金,研究冷却方式对K416B合金组织和力学性能的影响.结果表明:合金铸态组织和力学性能受冷却方式影响较大.单壳方式下合金MC碳化物多呈骨架状,共晶含量较高;埋砂方式下合金MC碳化物呈块状,共晶含量较低;单壳和埋砂两种方式下合金共晶形貌呈蜂窝状,γ′相尺寸较小,MC碳化物形貌完好,合金室温拉伸强度和持久寿命较高;一直埋砂方式下合金共晶形貌多为块状,部分MC碳化物分解为M6C,γ′相发生了明显粗化,合金室温拉伸强度和持久寿命显著下降.In order to clarify the origins of the instability of as-cast microstructure and properties of K416B alloy, K416B alloy samples were prepared by different cooling methods, and the effect of cooling methods on the microstructure and mechanical properties of K416B alloy was studied. The results show that the as-cast microstructure and mechanical properties of the alloy are greatly affected by the cooling methods. The morphologies of MC carbide in the alloy prepared by the single shell method are mostly skeleton-like and the eutectic content is higher. The MC carbide in the alloy prepared by the buried sand method is blocky and the the eutectic content is lower. The morphologies of eutectics in the alloy prepared by both of the single shell and the buried sand methods are honeycomb-like, the size of γ ′phase is smaller, the morphology of MC carbide is intact, meanwhile the tensile strength at room temperature and the creep life are higher. The morphologies of eutectics in the alloy prepared merely by the buried sand mothod are mostly blocky, some MC carbide gets decomposed into M6C carbide, and γ′phase is coarsened obviously. Moreover the tensile strength at room temperature and the creep life decrease significantly.

关 键 词：镍基高温合金 冷却方式 共晶 MC碳化物 M6C碳化物 γ′相 室温拉伸试验 持久性能 

分 类 号：TG24[金属学及工艺—铸造] TG113.12