激光热处理应用研究中 ,当激光作用区临近工件边界时 ,防止边界熔化并让边界获得满意的热处理是必须认真处理的重要问题。实验研究表明 ,根据被处理工件的边界形状设计光阑并将光阑放在合适位置 ,可以有效地避免边界损伤并获得高质量的处理结果。为简化热作用研究 ,通常可以将被处理材料视为热物性参数为恒量的连续介质 ,而当处理工件的边界由相交平面边界构成时 ,可以通过引入适当的像热源来处理边界问题 ,因此 ,用这种热处理温度场的半解析计算方法可以满意地获得边界附近的瞬态温度场。提出了一种边界保护的简单方法 ,并利用激光热处理温度场的半解析计算方法作出证明。研究结果表明 ,合适选择边界保护宽度 ,不但能够有效保护边界 ,并能在边界附近得到深度均匀的硬化带 In the application of laser heat treatment, it is an important issue that must be dealt with seriously to prevent the boundary from melting and to obtain a satisfactory heat treatment for the boundary when the laser action area is near the workpiece boundary. Experimental results show that designing the stop according to the boundary shape of the workpiece to be processed and placing the stop in the proper position can effectively avoid boundary damage and obtain high-quality processing results. In order to simplify the study of thermal effects, the material to be treated can usually be considered as a continuum of thermophysical parameters. When the boundaries of the workpiece are composed of intersecting planar boundaries, boundary problems can be dealt with by introducing appropriate image heat sources. The transient temperature field near the boundary can be satisfactorily obtained by using the semi-analytical method of temperature field of this heat treatment. A simple method of boundary protection is proposed. The method is proved by the semi-analytical method of temperature field of laser heat treatment. The results show that the appropriate choice of the width of the boundary protection can not only effectively protect the boundary but also obtain a uniform depth of hardening around the boundary