| With the rapid development of various industries in the national economy,the demand for iron and steel materials continues to increase.Actually,more stringent and demanding requirements are imposed on the material properties.It is difficult for a single metal material to meet and satisfy many special conditions in practical applications.Therefore,the research of composite materials will become the development trend and important direction of the material field.Wear-resistant steel composite materials can make full use of the performance characteristics of each component,making it high-strength,high toughness,high temperature resistance,corrosion resistance,high cost performance and other comprehensive characteristics.Therefore,the high performance wear-resistant composite materials are of great significance in the key parts,such as applied to fast wear shearer,scraper conveyor,mine hoist and so on.This article aims at the problems that currently occur in the rolling of wear-resistant steel/carbon steel double-layer composite panels,such as the temperature of the composite plate drops rapidly and affects the diffusion bonding of the metal atoms at the interface during the rolling,the strength of the composite plate at the interface is low,the residual stress is slightly higher,and the plate shape has a turtle back defect and so on.This article adopted vacuum hot-rolled NM400/Q345 R composite plate to prepare samples,and aimed at studying the vacuum rolling production process and technology after rolling the organization performance analysis,then utilized finite element simulation technology and experimental methods to study the wear resistance Composite board manufacture process:Based on the thermal-coupling algorithm,by using ABAQUS FEA software hot rolling the clad layer is wear-resistant steel NM400 and the base of clad plates is carbon steel Q345 R wear-resistant steel clad model is established.The double layer resistance was studied and analyzed.When rolling mill steel composite plate is simulated at a temperature of 1200°C,the stress field,strain field distribution,residual stress,and temperature field at different reduction rates for three groups of different thickness ratios are used to analyze the thickness.The influence of ratio and reduction ratio on the compounding effect of rolling compounding results in a good composite process parameter,and the range of optimal thickness ratio and reduction ratio is obtained based on the composite criteria.The microstructure and basic properties of NM400/Q345 R wear-resistant steel clad plate samples after vacuum hot rolled were observed and tested,optical microscope、scanning electron microscope and EBSD energy spectrum analysis were used to investigate and observed the microstructure topography of composite interface,degree of elements diffusion etc.and the factors were analyzed.A series of mechanical properties tests were performed,such as micro hardness tester was used to test the hardness of the wear-resistant steel composite plate near the interface,hardness variation near the interface were obtained,meanwhile,the tensile and bending test,the effects of rolling process parameters on the microstructure,mechanical properties and bonding strength of tensile fracture are discussed.the intrinsic relationship between microstructure and properties was studied,the disparity between microstructure topography and comprehensive performance of NM400/Q345 R wear-resistant steel clad plate samples under different rolling process parameters were compared,and finally,the hot rolling process suitable for the wear-resistant steel NM400/Q345 R composite plate is obtained. |
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