锻压技术

挤压成形工艺下GH2070P（HT700P）铁镍基高温合金无缝管微观组织特征及强化机制

英文标题：Microstructure characteristics and strengthening mechanism of Fe-Ni-based superalloy GH2070P(HT700P) seamless tube under extrusion forming process

作者：李媛媛秦瑞廷陈献刚周仲成王燕玲张子杨

单位：内蒙古北方重工业集团有限公司特钢事业部

关键词：HT700P铁镍基高温合金挤压成形微观组织力学性能第二相析出强化

分类号：TG376.9

出版年,卷(期):页码：2025,50(3):255-261

摘要：

采用150 MN制坯机和360 MN挤压机试制了HT700P铁镍基高温合金无缝管，对试制的HT700P铁镍基高温合金无缝管的系列温度拉伸性能及微观组织、低倍夹杂、晶粒尺寸及第二相析出物特征进行了系统的表征。结果表明：固溶后HT700P铁镍基高温合金室温下的平均屈服强度约为343 MPa，700 ℃高温条件下的平均屈服强度约为380 MPa；所试制的高温合金以奥氏体组织为主，晶粒平均直径约为Φ99.3 μm，晶粒度约为3.0级；非金属夹杂以B类、D类非金属夹杂为主，夹杂等级均为0.5。所试制的HT700P铁镍基高温合金无缝管的强化机制以细晶强化及第二相析出强化为主，细晶强化与第二相析出强化引起的强度贡献分别约占总强化量的30.7%和66.9%

Fe-Ni based superalloy HT700P seamless tubes were trial-produced by 150 MN blank making machine and 360 MN extruder, and the tensile properties, microstructure, macro inclusions, grain size and characteristics of second-phase precipitates for the trial-produced Fe-Ni based superalloy HT700P seamless tubes at a series of temperatures were systematically characterized. The results show that after solution treatment, the average yield strength of Fe-Ni based superalloy HT700P at room temperature is about 343 MPa, and the average yield strength at 700 ℃ is about 380 MPa. The trial-produced superalloy mainly consists of austenite structure, with an average grain diameter of about Φ99.3 μm and a grain size of about 3.0. The non-metallic inclusions are mainly type B and type D non-metallic inclusions, and the inclusion grades are all 0.5. The strengthening mechanisms of the trial-produced Fe-Ni based superalloy HT700P seamless tube is mainly fine grain strengthening and second-phase precipitation strengthening, and the strength contribution caused by fine grain strengthening and second-phase precipitation strengthening accounts for about 30.7% and 66.9% of the total strengthening, respectively.

基金项目：

作者简介：李媛媛（1992-），女，硕士，工程师 E-mail：m15661492881@163.com 通信作者：秦瑞廷（1986-），男，硕士，高级工程师 E-mail：842810041@qq.com

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