【摘要】 以近共析钢50Si2Mn3钢为对象,研究了不同磁场强度对磁诱发珠光体(MIP)相变开始点及可诱发出珠光体组织的最高温度,建立了相变起始点与磁场场强-相变温度-相变时间的关系曲线。结果表明:磁场对诱发珠光体相变最高温度的影响并不呈线性变化;磁场促进了易磁化<100>方向的晶粒于珠光体相变初期的形核与长大;存在着渗碳体以颗粒状或短杆状形态在块状铁素体内部的不连续析出方式,且后期珠光体转变量的增加主要是来自于原优先形成珠光体的长大,而非形核量的增加。更多还原

【Abstract】 Nearly eutectoid steel 50Si2Mn3 was selected as the testing subject,starting points and the maximum temperatures of magnetic induced pearlite phase transformation of the steel under different magnetic intensities were studied,and build up the curve about the phase transformation starting point and magnetic intensity-temperature-time. The results show that the influence of magnetic field on the maximum phase transformation temperatures is not linear. Magnetic field promotes < 100 >-oriented grains nucleation and growth at early transformation stage. Cementite with granular or short rod precipitate discontinuously from the block ferrite,and the increased amount of pearlite is mainly from that pearlite preferentially formed grew up,rather than the increasing nucleation amount.更多还原