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西安交大等单位对低碳马氏体的研究与应用表明:对低碳钢(包括低碳合金钢)进行淬火强化,以获得低碳马氏体,是充分发挥低碳钢强度潜力的有效途径。低碳马氏体在机械性能方面,具有高强度与良好的塑性、韧性相结合的特点(σ_b=120～150kg/mm~2,σ_0.2=100～150kg/mm~2,δ_s≥10%,ψ≥40%,α_k=6kgM/cm~2):低的冷脆转化温度;在静载荷、疲劳载荷以及多次冲击载荷下的缺口敏感度和过载敏感性都较低,且均优于中碳钢调质态;在工艺性能方面,可发挥低碳钢固有的优良的冷成型性和焊接性,较小的热处理脱碳和淬火变形开裂倾向等的优点。它在提高产品质量、减轻零件重量和节约金属等方面取得了显著成效。因此近年来低碳马氏体在矿山、石油、汽车、
Xi’an Jiaotong University and other units of low-carbon martensite research and application shows that: low-carbon steel (including low-carbon alloy steel) for quenching to obtain low-carbon martensite, is to give full play to the potential strength of low carbon steel effective way . The low-carbon martensite has the characteristics of high strength, excellent ductility and ductility (σ_b = 120-150kg / mm ~ 2, σ_0.2 = 100-150kg / mm ~ 2 and δ_s≥10% , ψ≥40%, α_k = 6kgM / cm ~ 2): low cold brittle transition temperature; notch sensitivity and overload sensitivity under static load, fatigue load and multiple impact loads are lower, and are better than Medium carbon steel tempering state; in terms of process performance, low carbon steel can play an excellent cold formability and weldability, smaller heat treatment decarburization and quenching deformation and cracking tendency and so on. It has made remarkable achievements in improving product quality, reducing parts weight and saving metals. Therefore, in recent years, low-carbon martensite in mining, petroleum, automotive,