Nb元素对Mar-M246合金力学性能的影响研究  

Effect of Nb on the Property of Mar-M246 Alloy

作　　者：李慧威 胡博炜[1] 刘海稳[1] 习小军 李崇巍[1] Huiwei Li;Bowei Hu;Haiwen Liu;Xiaojun Xi;Chongwei Li(Beijing Beiye Functional Materials Corporation,100192)

机构地区：[1]北京北冶功能材料有限公司,北京100192

出　　处：《金属材料研究》2023年第3期37-42,共6页Research on Metallic Materials

摘　　要：高温合金中含有多种战略性金属资源,如Nb及稀土元素等,合理利用高温合金返回料是实现金属资源高效回收利用的关键。但是高温合金返回料在利用时可能会引人其他合金元素,本文以Mar-M246合金返回料在利用过程中可能引人Nb元素为出发点,采用真空感应熔炼炉冶炼了不同Nb元素含量的Mar-M246合金。采用热力学计算软件、三维光学显微镜(3DM)、扫描电镜(SEM)和万能试验机对不同Nb元素含量的Mar-M246合金进行了组织和性能分析。结果表明,在Mar-M246合金中添加≤0.25w.t.%含量的Nb元素会扩大相和MC碳化物的析出温度区间,但不改变合金的析出相类型。Nb元素的添加对Mar-M246合金强度影响不大,随着Nb元素含量的增加合金强度降低在100MPa以内,同时合金塑性得到改善.There are a variety of strategic metal resources,such as Nb and rare-earth elements in superalloys,therefore rational utilization of superalloy returns is an important key to achieve efficient recycling of metal resources.In this paper,when the process of Mar-M246 alloy returns utilization may bring Nb element which will effect the microstructure and properties of the alloy,then using the vacuum melting furnace smelt Mar-M246 alloy with different Nb contents.Thermodynamic calculation software,three-dimensional microscope(3DM),scanning electron microscope(SEM)and universal testing machine were used to characterize the microstructures and tensile property of Mar-M246 alloy with different Nb contents.The result show that the type of precipitates will not change if the Nb content is less than 0.25w.t.%in alloy,but expand'phase and MC carbide precipitation temperature range.And it was little effect on the strength of Mar-M246 alloy,the strength decreases within 100MPa with the increase of Nb contents,while the plasticity of the alloy was improved.

关 键 词：Nb元素 高温合金返回料 真空感应熔炼炉 MC碳化物 合金塑性 万能试验机 热力学计算 稀土元素 

分 类 号：TG1[金属学及工艺—金属学]