A series of Fe69.4Mn10Co10Cr10N0.6 multi-principal element alloys were processed by intercritical annealing near Ac3 temperature and the subsequent tempering at different low temperatures.The results show that the alloy processed by intercritical annealing consists of uniformly dispersed submicron-sized ultrafine ferrite and austenite grains,as well as the quenched martensite laths in the austenite.After tempering at different temperatures,the average grain sizes of ferrite and austenite in the intercritical annealed alloy significantly increase to the micron scale,and the room-temperature yield strength and tensile strength of the alloy increase simultaneously,while the ductility remains almost the same.This is attributed to the fact that the partition of Mn and N during tempering enhances the stability of austenite,and the increase of heterogeneous interfaces between ferrite(soft domains)and martensite(hard domains)after tempering contributes to the more significant hetero-deformation induced strengthening and hardening during the tensile deformation.The room-temperature yield strength and tensile strength of the alloy tempered at 300℃reach approximately 690 MPa and 1 400 MPa,respectively,while a uniform elongation of 17％and a total elongation of 26％are maintained.
关键词
多主元合金/临界退火/回火/微观组织/力学性能
Key words
multi-principal element alloy/intercritical annealing/tempering/microstructure/mechanical property
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基金项目
国家重点研发计划项目(2021YFA1200203)
国家自然科学基金资助项目(51922026)
National Key Research and Development Program of China()
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