【摘要】 以中碳耐磨钢为研究对象,通过热膨胀法测定了中碳耐磨钢CCT曲线,分析了动态冷却条件下其组织变化,结果表明当冷速小于5℃/s时得到的组织为铁素体+贝氏体,随着冷速的增加铁素体的数量减少,当冷速达到10℃/s时得到的组织为贝氏体组织,随着冷速的增加贝氏体的形态由粒状贝氏体逐渐转换为板条贝氏体,当冷却速度在15℃/s～50℃/s之间时得到的组织为贝氏体+马氏体的组织。当冷速大于30℃/s的时候发生马氏体转变,生成的组织主要为马氏体组织。建议直接淬火工艺冷却速度15℃/s,冷却开始温度应该在800～850℃左右,而冷却结束温度在400～450℃左右。更多还原

【Abstract】 It is based on the medium carbon wear resistant steel to study the microstructure changes under the dynamic cooling condition by thermal expansion method,the CCT curve is also determined,the results shows that the ferrite +bainite were obtained when the cooling rate is less than 5℃/s,with the cooling rate increase,the ferrite amount decreased,when the cooling rate reached the 10℃/s,the full bainite were obtained.As the cooling rate further increasing,the granular bainite transformed into the lathe bainite,when the cooling rate is 15℃/s~50℃/s,the bainite +martensite microstructure were obtained.When the cooling rate is above 30℃/s,the martensite were obtained.The direct quenching process is proposed in this work,the cooling temperature should start in 800~850℃ and end about 400~450℃.更多还原