在机械制造中,中碳结构钢用量最大,而中碳结构钢制造的工件又常须进行调质热处理。所谓调质就是指钢件被加热到Ac_3以上进行完全淬火,然后再高温索氏体回火。这两次加热和长时间的保温,耗能是很大的,且容易引起工件的变形、开裂和氧化、脱碳。因此,改革调质热处理工艺是节省能源,提高经济效益的有效手段。 In the machinery manufacturing, the largest amount of carbon structural steel, and carbon steel structure often made of the workpiece conditioning and heat treatment. The so-called quenching and tempering means that steel is heated above Ac_3 for complete quenching, and then high-temperature sorbite tempering. These two heating and prolonged insulation, energy consumption is great, and easily lead to the deformation of the workpiece, cracking and oxidation, decarbonization. Therefore, the reform of heat treatment process is to save energy and improve economic efficiency of the effective means.