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一、确定好加热温度,保证组织的预期转变要使零件淬火淬得好,首先就要根据不同的钢种,确定好淬火加热温度。因为这里不但有像第一讲中所说的组织转变,还有其他一些与之相关联的问题。不论是碳钢,还是合金钢,只要原始平衡组织中有过剩铁素体,则一般都加热到使铁素体完全溶解到奥氏体中的某一温度范围(A_(c3)+30～50℃)。否则,淬火冷却后除奥氏体转变成马氏体外,铁素体仍然保留在钢的淬火组织中,那就会达不到高硬度的要求。如果原始组织中有过剩的渗碳体,则大多
First, determine the heating temperature, to ensure the expected changes in the organization To quench the parts quenched well, we must first according to different types of steel, determine the quenching temperature. Because here not only has the organizational change mentioned in the first lecture, but also has some other problems associated with it. Whether carbon steel or alloy steel, as long as there is excess ferrite in the original equilibrium structure, the ferrite is generally heated to such a temperature that the ferrite is completely dissolved into the austenite (A c 3 +30 to 50 ℃). Otherwise, after quenching and cooling except austenite into martensite, ferrite still retained in the quenched steel, it will not reach the requirements of high hardness. If the original organization has excess cementite, then most