Simulation Calculation Of Heat Treatment Parameters Of The New Wear-resistant Steels And Research On There Microstructure And Properties

Wear-resistant steel is the material with the largest amount of wear-resistant materials today.A large number of wear-resistant steel workpieces are used in metallurgy,construction materials,mining and other fields.Due to the different degrees of wear and impact and the complex shape of some workpieces during service,the materials required for the workpieces need to have high wear resistance and processing performance.In this paper,from the perspective of composition design,four new types of wear-resistant steels are designed.The heat treatment parameters and properties are calculated by using JMatpro simulation software,and the heat treatment process is designed according to the calculation results to explore and study the properties of the material.The heat treatment parameters of 0.20C5Cr1Ni1.25Mo1 V,0.35C5Cr1Ni1.25Mo1 V,0.44C5Cr1Ni1.25Mo1 V,0.60C5Cr1Ni1.35Mo1 V wear-resistant steel are simulated and calculated,and the results show that the completely austenitized temperature of the four materials don't exceed 870?.And the maximum critical cooling rate doesn't exceed 0.4?/s.After quenching at a higher critical cooling rate,the mechanical properties of 0.44C5Cr1Ni1.25Mo1 V are close to 0.60C5Cr1Ni1.35Mo1 V,and the mechanical properties of 0.20C5Cr1Ni1.25Mo1 V are the worst.And tempering at 500?~600? high temperature,all four materials will precipitate MC phase which is beneficial to enhance the wear resistance of the material.The post-forging heat treatment test on the four materials shows that annealing is more suitable as the post-forging heat treatment process than normalizing + tempering.Annealing can not only effectively eliminate the segregation zone existing in the forged material,but also the annealed structure does not contain obvious martensite structure.In this study,0.35C5Cr1Ni1.25Mo1 V and 0.60C5Cr1Ni1.35Mo1 V are selected for quenching test at 900?~1010?,and the quenching hardness curves of the two materials with temperature are obtained.The results show that in the range of 900?~1010?,the quenching hardness of 0.35C5Cr1Ni1.25Mo1 V decreases with increasing temperature.The hardness of 0.35C5Cr1Ni1.25Mo1 V is as high as 53.7 HRC when quenched at 900?,and the hardness can still reach 51.6 HRC when quenched at 1010?.The quenching hardness of 0.60C5Cr1Ni1.35Mo1 V increases with temperature and then decreases.The hardness reaches the highest value of 61.3 HRC when quenched at 960?.0.35C5Cr1Ni1.25Mo1 V and 0.60C5Cr1Ni1.35Mo1 V are quenched at 1010? and tempered at different temperatures(560?,580?),the mechanical properties after tempering are tested,and it is found that the hardness and tensile properties of the two materials decreased with the increase of tempering temperature,while the impact properties are improved.After tempering,the hardness and impact properties of the two materials are better than some low alloy martensitic wear-resistant steels such as ZG40SiMnCr3 CuMoRe and ZG40 Si MnCr2Si MoV.