轧制了不同Al含量(0、2％、4％)的304不锈钢,利用OM、XRD、EPMA研究其轧制态显微组织,并对其力学性能及耐腐蚀性进行研究.结果表明:随Al含量的增加,合金基体由单一的γ相转变为α+γ双相组织,Al元素分别以固溶和Al4C3沉淀相的形式分布在基体上,随Al含量增加,析出的Al4C3相增多.合金的强度随着Al含量的增加,先降低后增加,而伸长率逐渐降低.利用SEM分析合金的断口形貌表明,其断裂形式均为韧性断裂.合金腐蚀速率随着Al含量增加明显降低,含4 mass％Al304比304耐晶间腐蚀性能提高一倍以上.Al4C3相的析出减少了贫铬区及合金表面形成更为稳定的Al203钝化膜是其耐蚀性提高的主要因素.
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