Continuous gradient temperature rolling process of 10Ni5CrMoV heavy plate
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 defor-mation 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 sur-face 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 microstructure.Deformation is more likely to penetrate into the core of the heavy plate under CGTR,holding significant importance for homogenizing microstructure,enhancing mechanical properties,and improving the overall quality of heavy plates.
heavy plateconstitutive model10Ni5CrMoV steelgradient temperature rollingfinite element analogy
NETL
NSTL
万方数据
