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低碳钢由于含碳量低，难以通过常规热处理方法达到理想的硬化效果。我们根据激光热处理的特点，对低碳钢进行了硬化处理。本文通过对含Ｃ量０．２％的钢样进行激光热处理实验，得到了显微硬度ＨＶ５００左右，深度０．５ｍｍ的硬化层。金相分析表明，相变区为板条马氏体组织。研究分析表明，晶粒细化、高的马氏体含量、马氏体高位错密度和固溶含碳量是获得超高硬度的主要原因。
Low carbon steel due to low carbon content, it is difficult to achieve the desired heat treatment by conventional curing effect. According to the characteristics of laser heat treatment, we have hardened the mild steel. In this paper, by laser heat treatment of steel samples containing 0.2% C, hardened layers with a hardness of about HV500 and a depth of 0.5 mm were obtained. Metallographic analysis showed that the phase transition zone lath martensite. Research and analysis show that grain refinement, high martensite content, high martensite dislocation density and dissolved carbon content are the main reasons for obtaining ultrahigh hardness.