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为了得到细晶粒的组织,轧辊锻坯在终锻时的加热温度取决于变形程度(锻造比)。当锻造比小于1.6时,加热温度可降低100～150℃。低温加热,在大多数加热炉中难以配套装炉,导致钢的变形抗力增大,因此,锻造生产率下降、此外,低温锻造时,钢的塑性降低,促使裂纹的形成。对于在热变形温度区向,具有低塑性的高碳轧辊钢90X来说,这样的锻造特别危险。很多结构钢锻件,可以加热到最高锻造温度(1200～1250℃),而与随后的变形程度无关,因为在锻造后进行热处理时,伴随着αγ转变,使晶粒细化,从而保证得到零件所必须的组织和性能。本文试图评定用热处理方法,矫正高碳轧辊用钢90Xφ,9X_2Mφ和75X_2ΓMφ锻造加热时所得到的粗晶粒组织的可能性。
In order to obtain fine-grained microstructure, the heating temperature of the roll blank during final forging depends on the degree of deformation (forging ratio). When forging ratio is less than 1.6, the heating temperature can be reduced by 100 ~ 150 ℃. Low temperature heating, in most furnaces is difficult to form a matching furnace, resulting in increased deformation resistance of steel, therefore, forging productivity decline, in addition, low-temperature forging, plastic reduction of steel to promote the formation of cracks. Forging in the hot deformation temperature zone, with low plasticity of the high carbon steel roll 90X, this forging is particularly dangerous. Many structural steel forgings can be heated up to the maximum forging temperature (1200-1250 ° C) regardless of the degree of subsequent deformation because the grain refinement is accompanied by αγ transformation during the heat treatment after forging to ensure that the parts Necessary organization and performance. This article attempts to assess the possibility of using heat treatment to correct coarse grain structure obtained by forging heating of 90Xφ, 9X_2Mφ and 75X_2ΓMφ steels for high carbon rolls.