新型热处理方法制备超高强度Inconel 718合金  

Ultra-high strength Inconel 718 alloy produced by a novel heat treatment

作　　者：冉蓉 王洋[1] 任富强 张元祥[1] 方烽 张维娜[1] 袁国[1] 王国栋[1] Rong RAN;Yang WANG;Fu-qiang REN;Yuan-xiang ZHANG;Feng FANG;Wei-na ZHANG;Guo YUAN;Guo-dong WANG(State Key Laboratory of Rolling and Automation(RAL),Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第7期2204-2218,共15页中国有色金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52104372);the Fundamental Research Funds for the Central Universities,China(No.N2107001);the Postdoctoral Research Foundation of China(Nos.2019M651129,2019TQ0053)。

摘　　要：为改善Inconel718合金的组织并优化性能,提出一种980℃,1 min高温超短退火和随后的双时效相结合的新型热处理方法。结果表明,超短退火处理产生了部分再结晶组织,KAM图表明即使在变形晶粒中也形成了再结晶晶核。因此,高温超短退火克服了再结晶势垒,使得后续的再结晶过程可以在较低温度的时效处理过程中完成,从而获得了均匀细化的组织(~3.59μm)。980-1min-aged样品具有优异的拉伸性能,室温极限强度和总伸长率分别为1600 MPa和19%。650℃热拉伸条件下的极限强度和伸长率分别约为1350 MPa和26%。因此,高温超短退火能有效提高Inconel718合金的性能。In order to ameliorate microstructure and optimize properties of Inconel 718 alloy,a novel heat treatment method combining high-temperature ultra-short annealing at 980°C for 1 min with subsequent double aging was proposed.The results showed that ultra-short annealing generated partially recrystallized microstructure and recrystallized nuclei were formed even in deformed grains,which was confirmed by KAM maps.Therefore,high-temperature ultra-short annealing overcame recrystallization barrier,and the subsequent recrystallization process could be completed during aging treatment with relatively low temperature,resulting in the uniformly refined microstructure(~3.59μm).The 980-1min-aged sample exhibited outstanding tensile properties.The room temperature ultimate strength and total elongation were 1600 MPa and 19%,respectively.The corresponding values of hightemperature(650°C)tensile tests were~1350 MPa and~26%.Consequently,ultra-short annealing can be a promising route to enhance the properties of Inconel 718 alloy.

关 键 词：Inconel 718合金 超高强度 δ相析出相 再结晶行为 时效处理 

分 类 号：TG156[金属学及工艺—热处理] TG132.3[金属学及工艺—金属学]