10Ni5CrMoV厚板连续差温轧制工艺  

Continuous gradient temperature rolling process of 10Ni5CrMoV heavy plate

作　　者：王宝山[1] 王卫卫[1] 张宏亮[1] 张翔博 冯光宏[1] WANG Baoshan;WANG Weiwei;ZHANG Hongliang;ZHANG Xiangbo;FENG Guanghong(Metallurgical Technology Institute,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司冶金工艺研究所,北京100081

出　　处：《钢铁》2024年第7期94-101,共8页Iron and Steel

基　　金：国家重点研发计划资助项目(2023YFB2604805);钢铁研究总院重大基金资助项目(事20G61760ZD)。

摘　　要：厚板是船舶、化工、高压管道、压力容器等行业必需的钢材品种,但在轧制成形时由于心部变形不充分,导致内部孔洞难以压合,存在心部力学性能偏低、厚度方向上性能不均匀的问题。以10Ni5CrMoV厚板为例,研究了其在差温轧制工艺下的变形规律,目的是解决厚板心部变形不足的问题,为差温轧制在厚板成形中的应用提供理论依据。首先通过Gleeble热压缩试验测定了10Ni5CrMoV钢的高温真实应力-真实应变曲线,建立了10Ni5CrMoV钢的本构方程,基于此本构模型,应用有限元方法进行了10Ni5CrMoV厚板5道次轧制过程的数值模拟,分析了心-表温度分布规律和应变分布规律,并进行了轧制验证试验,对比了不同轧制工艺下厚度方向上的变形及组织均匀性。结果表明,当5道次轧制的总变形量为58.3%时,与均温轧制相比,连续差温轧制和首道次差温轧制10Ni5CrMoV厚板心部的等效塑性应变分别提高了5.40%和1.04%,连续差温轧制工艺最有利于心部变形,但是,需要进行道次间冷却才能维持厚板差温轧制所需的心表大温差的温度分布状态。10Ni5CrMoV厚板变形均匀程度依次为连续差温轧制>首道次差温轧制>均温轧制,连续差温轧制后内部晶粒明显细化、组织更均匀。连续差温轧制能有效促进变形向厚板心部渗透,这对均匀化组织、提高力学性能、改善质量具有重要意义。Heavy plate is an integral steel component playing a crucial role in various industries such as shipbuilding,the chemical sector,high-pressure pipelines,and pressure vessels.However,the insufficient central deformation of heavy plates poses challenges in closing internal voids,leading to suboptimal mechanical properties in the central layer and non-uniform performance across thickness.The 10Ni5CrMoV heavy plate was used as the subject to study the deformation law of gradient temperature rolling(GTR)process,aiming to solve the problem of insufficient deformation in the core of heavy plate and providing theoretical support for applying GTR in heavy plate forming.Firstly,the high temperature true stress-true strain curve of 10Ni5CrMoV steel was determined through a hot compression test,and the constitutive equation for the steel was established.Using this model,a finite element simulation of the five-pass rolling process for the 10Ni5CrMoV heavy plate was conducted.Then,temperature distribution and strain distribution from the surface to the core were obtained through analysis,and experimental verification of rolling was performed before ultimately comparing the deformation and microstructure homogeneity in the thickness direction under different rolling processes.Results indicate that,with a 58.3% deformation after five-pass rolling,the central equivalent plastic strain of the 10Ni5CrMoV heavy plate formed by continuous gradient temperature rolling(CGTR)and the first pass gradient temperature rolling(FGTR)increased by 5.40% and 1.04%,respectively,compared to the uniform temperature rolling(UTR)process.In other words,CGTR is the optimal process for improving core deformation,but inter-pass cooling is necessary to maintain the substantial temperature difference between the surface and the core required for the heavy plate's GTR.The deformation homogeneity of the 10Ni5CrMo heavy plate followed the order is CGTR>FGTR>UTR.Notably,CGTR significantly refined internal grain size and created a more homogeneous microstructur

关 键 词：厚板 本构模型 10NI5CRMOV钢 差温轧制工艺 有限元模拟 

分 类 号：TG335.51[金属学及工艺—金属压力加工]