Ni和Cu合金化对Fe-Mn-Al-C奥氏体轻质钢微观组织和力学性能的影响  

Effect of Ni and Cu Alloying on Microstructure and Mechanical Properties of Fe-Mn-Al-C Austenitic Lightweight Steel

作　　者：杨阳 王泽奎 陈晨[1,2,3] 马华 杨志南 张福成 YANG Yang;WANG Zekui;CHEN Chen;MA Hua;YANG Zhinan;ZHANG Fucheng(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004;Hebei Ley.Lab.for Optimizing Metal Product Technology and Performance,Qinhuangdao 066004)

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004 [2]燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛066004 [3]河北省金属产品工艺与性能综合优化实验室,秦皇岛066004

出　　处：《机械工程学报》2024年第8期154-164,共11页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52201143,52171049);河北省高等学校科学技术研究(BJK2023033);河北省创新能力提升计划(22567609H)资助项目。

摘　　要：为进一步提高Fe-Mn-Al-C系高强度钢的服役性能,利用Ni和Cu对80Mn20Al5奥氏体轻质钢进行合金化。通过扫描电子显微镜、透射电镜和电子背散射衍射等手段,分析对比了固溶态、冷轧后900℃和1000℃退火态的80Mn20Al5、80Mn20Al5Ni6和80Mn20Al5Cu2钢的微观组织和常规力学性能。结果表明:三种试验钢在固溶态下均为单相奥氏体组织,平均晶粒尺寸均约为80μm,强塑性能相近。经过冷轧和900℃退火处理后,三种试验钢强度都得到了提高,而延伸率基本不变,其中80Mn20Al5钢为单一奥氏体组织,而80Mn20Al5Ni6钢的组织为奥氏体与细小的B2-AlNi相,并且保留了部分冷轧变形组织特征,形成了层状混晶,这都促使其获得了最优的强塑性搭配。80Mn20Al5Cu2钢的组织为奥氏体与弥散分布的富铜相,晶粒尺寸细化显著,约为8μm,细晶强化与富铜相弥散强化的共同作用提高了试验钢的强度同时保持了较高的塑性。而经冷轧和1000℃退火后,三种试验钢的奥氏体晶粒也得到细化,强塑性能仅略有提升。In order to further improve the service performance of Fe-Mn-Al-C high strength steel,the 80Mn20Al5 austenitic lightweight steel is alloyed by Ni and Cu,respectively.The microstructures evolution and mechanical properties of 80Mn20Al5,80Mn20Al5Ni6 and 80Mn20Al5Cu2 austenitic lightweight steel after solution,cold rolling at 900℃and 1000℃were contrastive analyzed by electron microscopy,transmission electron microscopy and electron backscattered diffraction.The results show that the three tested steels are single-phase austenite after solution treatment and the average grain size is about 80μm and the tensile properties almost the same.After cold rolling and annealing at 900℃,the strength of the three tested steels is improved,while the ductility is basically unchanged.The 80Mn20Al5 steel is single austenite,while the microstructure of 80Mn20Al5Ni6 steel consists of austenite phase and fine B2-AlNi phase.In addition,part of cold deformation morphology is retained and layered mixed crystals are formed.These make it obtain the optimal combination of strength and plasticity.The microstructure of 80Mn20Al5Cu2 steel consist of austenitic phase and dispersed copper-rich phase.The grain size of 80Mn20Al5Cu2 steel is significantly refined to about 8μm.Both refined grain boundary strengthening and dispersion strengthening of copper-rich can improve the strength and maintain high plasticity of the steel.After cold rolling and annealing at 1000℃,the austenite grains of the three tested steels are also refined while the strength and plasticity increase slightly.

关 键 词：奥氏体轻质钢 合金化 B2-AlNi相 富铜相 强塑性 

分 类 号：TG142[一般工业技术—材料科学与工程]