To investigate the effect of alternating magnetic field on austenite transformation process in the case of rapid heating, the austenite kinetics model of AISI 1045 steel was built for spot continual induction hardening (SCIH) process. The results shows that the effect of alternating magnetic field on austenite transformation fraction reaches the maximum (about 3%) when heating rate is the lowest. Relatively low magnetic flux density still has a certain effect on the austenite transformation process during the SCIH process. Concave surface structure can reduce the influence scope of alternating magnetic field on surface in all cases and the minimum influence scope appears when the feed path of inductor is longitudinal. Convex surface structure can minimize the influence scope of alternating magnetic field in depth when the feed path of inductor is longitudinal. The austenite distribution of transitional region on surface for horizontal movement is more uniform than that for longitudinal movement. The austenite distribution of transitional region in depth for longitudinal movement is more uniform than that for horizontal movement. The simulated results are consistent with the experimental results and the austenite transformation kinetics model developed for SCIH process is valid.

为了研究快速加热情况下交变磁场对奥氏体转变过程的影响，建立了AISI 1045钢的奥氏体动力学模型用于点连续感应淬火（SCIH）过程。结果表明，当加热速率最低时，交变磁场对奥氏体相变分数的影响最大（约3％）。相对较低的磁通密度仍然对SCIH过程中的奥氏体转变过程具有一定的影响。凹形表面结构在任何情况下都可以减小交变磁场对表面的影响范围，而当感应器的馈电路径为纵向时，最小的影响范围出现。当感应器的馈电路径为纵向时，凸表面结构可以最大程度地减小交变磁场在深度上的影响范围。水平运动的过渡区域的奥氏体分布比纵向运动的更均匀。纵向运动的深度过渡区的奥氏体分布比水平运动的奥氏体分布更均匀。模拟结果与实验结果吻合，为SCIH工艺开发的奥氏体转变动力学模型是有效的。