高返回比GH4738合金的热变形行为及微观组织演变  

Hot deformation behavior and microstructural evolution of high-revert-ratio GH4738 superalloy

作　　者：王姝珺 田庆旭 曲敬龙 王广磊 武慧慧 秦卫东 张华[1] 江亮 陈淑英 孟范超 WANG Shujun;TIAN Qingxu;QU Jinglong;WANG Guanglei;WU Huihui;QIN Weidong;ZHANG Hua;JIANG Liang;CHEN Shuying;MENG Fanchao(Institute of Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China;Wrought Superalloy Products Division,Gaona Aero Material Co.,Ltd.,Beijing 100081,China;Sichuan CISRI-Gaona Forging Co.,Ltd.,Deyang 618099,China;Shandong Hongshan Aviation Forging Co.,Ltd.,Yantai 265712,China)

机构地区：[1]烟台大学精准材料高等研究院,烟台264005 [2]北京钢研高纳科技股份有限公司变形高温合金事业部,北京100081 [3]四川钢研高纳锻造有限责任公司,德阳618099 [4]山东宏山航空锻造有限责任公司,烟台265712

出　　处：《中国有色金属学报》2025年第3期903-917,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2021YFB3700404)。

摘　　要：高温合金返回料的回收再利用对提升我国高温合金产业的资源利用效率具有重要意义。本文对比分析了全新料和含60%(质量分数)切削返回料的GH4738合金在热变形过程中的力学响应和组织演变行为。通过980~1100℃热压缩试验,结合表征手段,分析了两种材料的初始微观组织特征及演变规律。结果表明,返回料与全新料的初始组织形貌相似,但返回料的平均晶粒尺寸略小,碳化物和γ'相的平均尺寸较大且分布密度低。在应变速率为0.1 s^(-1)的热变形条件下,两种材料表现出相似流变特性,但返回料在1020和1060℃时的峰值应力降低7%~10%,这与碳化物粗化和γ'相密度降低相关。研究结果证实,合理的回收处理工艺能够有效保持GH4738返回料合金的组织完整性和热加工性能。Recycling and reuse of superalloy revert materials are of significant importance for improving resource utilization efficiency in China’s superalloy industry.This study compared the mechanical response and microstructural evolution between new material and GH4738 alloy containing 60%machining revert during hot deformation.Hot compression tests were conducted at 980-1100℃,combined with characterization methods,to analyze the initial microstructural features and evolution patterns of both materials.The results show that the initial microstructures of revert and new materials are similar,but the revert material exhibits smaller average grain size,larger carbides andγ′phases with lower distribution density.Under hot deformation at strain rate of 0.1 s^(-1),both materials display similar flow behaviors,while the peak stress of revert material decreases by 7%-10%at 1020℃and 1060℃,correlating with carbide coarsening and reducedγ′phase density.The study results confirm that appropriate recycling process can effectively maintain the microstructural integrity and hot workability of GH4738 alloy revert material.

关 键 词：GH4738合金 返回料 微观组织 热压缩行为 再利用 

分 类 号：TG146.15[一般工业技术—材料科学与工程]