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本文对各种钢的奥氏体化过程中,奥氏体内碳浓度的不均匀性及平均碳浓度变化的规律进行了分析计算。指出奥氏体化至铁素体消失时,奥氏体内碳浓度具有最大的不均匀范围和最低的平均碳浓度。从控制淬火组织形态(奥氏体晶粒大小、马氏体粗细及组织中两种形态马氏体的相对量等)的角度出发,认为奥氏体化至铁素体消失时淬火具有最好的强韧性,并提出中碳结构钢的 Ac_3和高碳工具钢的 A_(?)淬火的新工艺。为保证更好的强韧化效果,使钢中奥氏体具有更低的平均碳浓度和最大浓度梯度的不均匀性,要求最终淬火前的原始组织中,碳化物应呈均匀分布的较细的球状。据此,对目前传统淬火加热工艺提出了改进意见。
In this paper, the austenitizing process of various steels, the inhomogeneity of carbon concentration in the austenite and the variation of the average carbon concentration were analyzed and calculated. It is pointed out that when austenitization to the disappearance of ferrite, the intra-austenite carbon concentration has the largest non-uniform range and the lowest average carbon concentration. From the viewpoint of controlling the morphology of the quenched structure (austenite grain size, martensite thickness and the relative amounts of the two types of martensite in the structure, etc.), quenching is considered to be the best quenching when austenitization to ferrite disappears Strength and toughness, and put forward the new technology of Ac_3 of carbon structural steel and A_ (?) Quenching of high carbon tool steel. In order to ensure a better strengthening and toughening effect, austenite in steel has a lower average carbon concentration and a maximum concentration gradient inhomogeneity. The carbide in the original structure before the final quenching is required to be uniformly distributed and thinner Spherical. Accordingly, the current traditional quenching heating process proposed improvements.