王珏,顾晔林,胡亮,王俊杰,王伟娟

• 1:南京工程学院材料科学与工程学院
• 2:江苏省先进结构材料与应用技术重点实验室

摘要(Abstract)：

采用真空感应熔炼方法制备了一种新型低钴高温合金，利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和电子万能试验机等研究了固溶处理和高温时效处理对合金组织和高温拉伸性能的影响。结果表明：低钴高温合金铸态组织中包含(γ+γ′)共晶组织、富W/Ta的MC_((1))碳化物和富Ta/Hf的MC_((2))碳化物，以及大小两种尺寸的γ′相，Hf、Ta元素明显偏析于枝晶间。随着固溶温度升高和时间延长，(γ+γ′)共晶组织逐渐回溶、元素偏析消除，小尺寸γ′相的含量升高。固溶过程中MC_((1))碳化物逐渐溶解，边缘转变为富W的M_6C型碳化物，MC_((2))中Hf含量升高而Ta含量降低。经1295℃固溶处理6 h及1090℃高温时效8 h后，合金中的共晶组织的体积分数降至1.3%,具有较好的高温拉伸性能。

关键词(KeyWords)： 低钴高温合金;固溶处理;共晶组织;高温拉伸

Abstract:

Keywords:

基金项目(Foundation): 江苏省产业前瞻与关键核心技术竞争项目(BE2019027);; 江苏省先进结构材料与应用技术重点试验室开放基金(ASMA202106);; 南京工程学院大学生科技创新基金项目(TB202302065)

作者(Author): 王珏,顾晔林,胡亮,王俊杰,王伟娟

DOI: 10.13289/j.issn.1009-6264.2023-0508

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