42CrMo-R test steel was designed and smelted and rolled into a tyre.Effect of heat treatment process on microstructure and mechanical properties of the 42CrMo-R steel tyre were studied by means of metallographic microscope,scanning electron microscope,tensile testing machine,hardness tester and other methods.The results show that after quenching in the range of 830-980 ℃,the matrix of the 42CrMo-R steel tyre is lath martensite,when the quenching temperature exceeds 890 ℃,the proportion of lath martensite increases significantly,and when quenched at 860 ℃,the original austenite grain size distribution is uniform and the strength is the highest,so it is the optimal quenching temperature.Tempered in the range of 520-600℃,the tyre matrix microstructure are all tempered martensite.With the increase of tempering temperature,the hardness,tensile strength and yield strength all show a downward trend,while the elongation and percentage reducation of area basically show an upward trend.After quenching at 860 ℃ and tempering at 560-580 ℃,the 42CrMo-R steel tyre has a relatively high proportion of tempered martensite,a small amount of undissolved ferrite and there is a large margin of Rm,Rp0.2,hardness and elongation compared with customer requirements,and it has good microstructure and comprehensive mechanical properties.
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