张梦迪,刘建涛,张义文,贾建,邢鹏宇

• 1:钢铁研究总院高温材料研究所
• 2:北京钢研高纳科技股份有限公司
• 3:钢铁研究总院高温合金新材料北京市重点试验室

摘要(Abstract)：

原始颗粒边界(PPB)是在粉末加热固结过程中MC型碳化物在颗粒边界析出造成的,利用扫描电镜(SEM)和电子探针X射线显微分析仪(EPMA)研究了MC型碳化物在镍基高温合金中的溶解度与粉末高温合金中原始颗粒边界(PPB)的关系。结果表明:强碳化物形成元素(Ti、Zr、Hf、Nb、Ta)对应的MC型碳化物在镍与镍基高温合金中的溶解度顺序为:TiC>NbC>TaC>ZrC>HfC,同时温度越高MC型碳化物的溶解度越大;在镍基高温合金中溶解度较大的TiC容易在粉末高温合金的PPB上析出,而溶解度较小的TaC则避免了这种现象。未添加Ta元素的FGH4098合金中原始颗粒边界(PPB)上的MC型碳化物主要为TiC;添加Ta元素的FGH4098合金,制粉过程中会在粉末颗粒内部析出更多的含Ta的MC′型碳化物,在随后的热等静压过程中,这种MC′碳化物转变成为更高稳定性的MC型碳化物(Ta, Ti, Nb)C。(Ta, Ti, Nb)C存在富Ti的核心,Ti和C元素被"固定"在了碳化物中,阻碍了MC型碳化物在PPB上析出。

关键词(KeyWords)： 粉末高温合金;PPB;MC型碳化物;溶解度

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2017-Ⅵ-0008-0078)

作者(Author): 张梦迪,刘建涛,张义文,贾建,邢鹏宇

DOI: 10.13289/j.issn.1009-6264.2020-0477

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