设计一种新型中碳高硼铁合金,研究了淬火工艺对其淬火前后的显微组织和性能的影响.结果表明:中碳高硼铁合金铸态组织由珠光体、硼碳化合物以及马氏体组成,硼碳化合物以M23(B,C)6为主,并含有少量M(B,C),M,(B,C)和M2(B,C),体积分数为31.3％.在950℃、1000℃、1050℃和1100℃淬火,其基体组织转变成马氏体,并含有少量残余奥氏体,体积分数分别为3.5％、4.0％、4.6％和5.4％.在950-1100℃淬火,硼碳化合物的类型不变,局部溶解,出现断网现象,在不同温度淬火后硼碳化合物的体积分数分别为30.6％、29.1％、27.3％和26.4％;随着淬火温度的提高,基体中合金元素的固溶量增加,硼碳化合物逐渐减少,从而减轻了对基体的割裂作用.淬火后,中碳高硼铁合金的硬度和冲击韧性显著提高,在950-1100℃淬火后,冲击韧性提高,硬度呈现先增加后减小的趋势.
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