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材料工程  2013 

高温固溶热处理对HIP态FGH96合金中碳化物影响规律的体视学研究

DOI: 10.3969/j.issn.1001-4381.2013.11.008, PP. 43-49

Keywords: 粉末高温合金,高温固溶热处理,碳化物,定量表征,体视学

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Abstract:

利用金相显微镜,扫描电镜和透射电镜并结合体视学基本原理,对在不同固溶温度和冷却方式(空冷和炉冷)下热等静压(HIP)态FGH96合金中碳化物的数量、空间分布及尺寸分布等进行了定量表征和对比研究。结果表明HIP态FGH96合金中碳化物主要为富Nb和Ti的MC,在原始颗粒边界(PPB)上分布的碳化物主要为块状,在PPB区域以外分布的碳化物主要由块状和花状MC组成。在1180℃以下进行固溶热处理时,碳化物含量增加并且加剧了合金中的PPB;当固溶温度达到1180℃以上时,随着固溶温度的升高,合金中碳化物数量减少,PPB逐渐消失。1200℃固溶后炉冷,固溶在基体中的碳主要以非PPB碳化物形式重新析出,会导致合金中PPB碳化物数量的降低,即使合金中的碳化物总量与固溶热处理前几乎相同。另外,空冷合金中PPB碳化物尺寸为单峰分布,而炉冷合金中则表现为双峰,后者与炉冷过程中碳化物能够重新析出密切相关。

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