超高强度钢分区强化工艺参数对过渡区的影响  

Impact of Partitioned Strengthening Process Parameters on the Transition Zone in Ultra-High Strength Steel

作　　者：贾宾 赵军 徐浩杰 牛轻松 罗枢源 JIA Bin;ZHAO Jun;XU Haojie;NIU Qingsong;LUO Shuyuan(School of Materials Science and Engineering,Xiamen University of Technology,Xiamen 361024,China)

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024

出　　处：《厦门理工学院学报》2025年第1期9-16,共8页Journal of Xiamen University of Technology

摘　　要：为在超高强度钢分区强化工艺中设计出具有良好性能的过渡区,采用Deform-3D软件分析22MnB5钢板分区强化过程中韧性区域、完全硬化区域和过渡区域的变化规律;并设计三因素四水平的正交试验,采用极差法分析16组正交方案,研究分区强化工艺中淬火时间、模具温度梯度和保压力对过渡区微观组织和过渡区宽度的影响。结果表明,温度梯度和淬火时间是影响马氏体含量和过渡区宽度的显著因素。过渡区马氏体含量梯度随着温度梯度的变大而显著增大,过渡区宽度随着淬火时间的增大而增大。当模具温度梯度为8.5℃·mm^(-1),淬火时间为25 s,保压力为30 kN时,完全硬化区域平均马氏体含量达到95.7%,过渡区微观组织为梯度分布,马氏体含量梯度为4.3%·mm^(-1),过渡区宽21.6 mm,韧性区域马氏体含量34.3%。当模具温度梯度大于8.5℃·mm^(-1)、淬火时间大于20 s时,分区强化板料的过渡区能具备足够的宽度和均匀过渡的马氏体组织,为22MnB5超高强度钢分区强化的最佳工艺。To optimize transition zone performance in ultra-high strength steel partitioned strengthening processes,this study investigates the evolution patterns of ductile,fully hardened,and transition zones in 22MnB5 steel plates using Deform-3D finite element analysis,and analyzes the influence of quenching time,mold temperature gradient and holding pressure in the partitioned strengthening processes on microstructure and width of transition zone applying a three-factor four-level orthogonal experimental design and a range analysis for the evaluation of 16 orthogonal schemes.Results indicate that temperature gradient and quenching time constitute dominant factors affecting martensite content and transition zone dimensions.The martensite content gradient increases significantly with the expanding temperature gradients,while transition zone width expands proportionally to extended quenching durations.Optimal parameters are identified as mold temperature gradient at 8.5℃·mm^(-1),quenching time at 25 s,and holding pressure atf 30 kN,when optimal results are achieved with average martensite in fully hardened zones at 95.7%,gradient-distributed transition zone microstructure at 21.6 mm in width,martensite content gradient at 4.3%·mm^(-1),and martensite in ductile zones at 34.3%.Critical thresholds are established as temperature gradients exceeding 8.5℃·mm^(-1),and quenching time surpassing 20 s enable sufficient transition zone width and homogeneous martensite gradients,which represents the optimal partitioned strengthening protocol for 22MnB5 ultra-high strength steel.

关 键 词：22MnB5超高强度钢 分区强化 工艺参数 过渡区 性能梯度 温度控制 

分 类 号：TG316[金属学及工艺—金属压力加工]