奥氏体化温度对辗压圈圆成型NM360-YLJ耐磨钢组织与性能的影响

设计研发了360度辊压成型压路机振轮耐磨钢NM360-YLJ,研究结果表明:最佳的奥氏体化温度为870～910℃,淬火马氏体板条上分布着沿多个惯析方向析出的碳化物,宽度15～50 mm,长度60～110 mm,马氏体板条束内包含多个由大角度晶界构成的板条块,大角度晶界取向差主要分布在60°左右,所占比例为63.5%～66.9%,马氏体块宽度0.08～6.6μm,钢的屈服强度980～1 000 MPa、抗拉强度1 182～1 198 MPa、延伸率22%～25%、表面维氏硬度值363～379HV, -40℃低温冲击功160～175 J,具有良好的强韧性匹配以及辊压成型性能。

Effect of Austenitizing Temperature on Microstructure and Properties of Roll Pressing Round Formed NM360-YLJ Wear Resistant Steel

NM360-YLJ wear-resistant steel for press vibrating wheel of 360 degree roll pressing round-formed roller was designed. The results show that the optimum austenitizing temperature of steel is 870 ~910 T , carbides precipitated in multiple habitual directions are distributed on the martensite lath with a width of about 15 ~ 50 mm and a length of about 60-110mm, there are several large angle grain boundary structures in quenched martensite lath bundles, and the orientation difference distribution is mainly in 60° with martensite proportion 63. 5% ~ 66. 9% and martensite width 0. 08 ~ 6.6 μm. The properties of steel are yield strength 980 ?1 000 MPa, tensile strength 1 182 ?1 198 MPa, elongation 22% ~25% , surface vickers hardness value 363 ~379HV and low temperature impact energy at -40°C 160 to 175 J, better strength-toughess matching and roll pressing formed performance is obtained.