黄军剑,满卫芳,高双,何博

• 1:上海工程技术大学材料科学与工程学院
• 2:上海工程技术大学高温合金精密成型研究中心
• 3:上海船舶设备研究所

摘要(Abstract)：

采用扫描电镜、能谱仪和拉伸试验等研究了二次固溶加时效对K4648镍基高温合金组织与性能的影响。结果表明：二次固溶加时效处理后，合金中析出了尺寸更大的针状α相，M_(23)C_6碳化物的尺寸变小；随着二次固溶温度的升高，针状α相逐渐粗化，M_(23)C_6数量增多且大部分在晶界处连续分布。经过二次固溶加时效处理，合金抗拉强度显著提高，塑性略有下降。K4648合金的最佳二次固溶温度为1200℃,此时合金的抗拉强度达到810 MPa,相比一次固溶加时效提高了约39%,伸长率略微下降，从17.2%降为15.3%。

关键词(KeyWords)： K4648镍基高温合金;二次固溶;显微组织;力学性能;断裂行为

Abstract:

Keywords:

基金项目(Foundation): 上海市Ⅲ类高峰学科—材料科学与工程(高能束智能加工与绿色制造)

作者(Author): 黄军剑,满卫芳,高双,何博

DOI: 10.13289/j.issn.1009-6264.2023-0479

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