林鹏,马党参,孙立国,迟宏宵,周健,王周田,周文武

• 1:钢铁研究总院特殊钢研究所
• 2:抚顺特殊钢股份有限公司
• 3:中国二重集团万航模锻厂

摘要(Abstract)：

研究了不同固溶温度和和冷却方式对GH4698合金的组织、室温性能、高温性能及断裂韧性的影响。结果表明:1030℃低温固溶,合金获得细小均匀的晶粒尺寸;1030℃固溶+炉冷,γ′相初始尺寸偏大,屈服强度偏低,而1030℃固溶后空冷可以获得960 MPa室温屈服强度和750 MPa的750℃高温屈服强度,750℃高温断裂韧性达到13 kJ/m~2;1100℃高温固溶,晶界碳化物包膜,且大中尺寸γ′相与小尺寸γ′相的质量比值高,导致屈服强度不足;相比航空件标准热处理制度,模具材料用GH4698合金采用1030℃×8 h/AC、1000℃×4 h/AC、760℃×16 h/AC+700℃×16 h/AC的热处理制度,可以获得750℃服役温度下最佳的屈服强度和足够的塑性,满足热模锻的使用要求。

关键词(KeyWords)： 热处理;GH4698高温合金;组织;性能;热模锻

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 林鹏,马党参,孙立国,迟宏宵,周健,王周田,周文武

DOI: 10.13289/j.issn.1009-6264.2020-0387

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