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钢轨钢中常含有数量较多的条链状硫化锰夹杂物.试验表明,随热处理工艺不同,夹杂物对钢轨钢的疲劳磨损性能有不同的影响.硫化物的热膨胀系数远大于钢基体,如果钢轨进行淬火、回火处理,因淬火激冷中硫化物的收缩量比基体大,造成夹杂物与基体间的界面开裂.使钢显著弱化,疲劳磨损抗力大大降低;若钢奥氏体化加热后进行缓慢冷却,不但不发生界面开裂,而且还能得到较理想的细珠光体组织,使钢的疲劳磨损抗力不因较多硫化锰夹杂物的存在而明显降低.
Steel often contains a large number of chained manganese sulfide inclusions.Experiments show that with the different heat treatment process, inclusions on the fatigue properties of rail steel have different effects of the thermal expansion coefficient of sulfide is much larger than the steel substrate, if the rail Quenching, tempering, because quenching chilling sulfide shrinkage than the matrix, resulting in inclusions and matrix interface rupture, so that the steel is significantly weakened, fatigue wear resistance greatly reduced; if the steel after austenitizing heating Slow cooling, not only does not occur interface cracking, but also can be more ideal fine pearlite structure, the fatigue resistance of steel fatigue not more manganese sulfide inclusions significantly reduced.