一、概述 化学热处理有悠久的历史,但其发展较快的时期还是近几十年的事。促进其发展的原因及是由于社会对机器产品的需要量日益增多,对零件质量的要求不断提高所致。某些机器零件在使用过程中受到冲击负荷以及磨损和表面接触应力的用作,为提高其承受能力延长使用寿命,应使零件在保持足够韧性和强度的条件下,具有一定厚度的硬面耐磨的表面层,如将低碳钢渗碳,使其表面含碳量增加,经适当热处理,就能满足上述 First, an overview Chemical heat treatment has a long history, but its rapid development is still a matter of recent decades. The reason for its development is due to the increasing demand for machinery products and the ever-increasing demand for the quality of parts. Some machine parts in the course of the impact load and wear and surface contact stress for use, in order to enhance its ability to extend the service life, should make the part to maintain sufficient toughness and strength of the conditions, with a certain thickness of hard surface resistance Grinding the surface layer, such as low carbon steel carburizing, so that the surface carbon content increased by the appropriate heat treatment, we can meet the above