采用SEM、EBSD、TEM、SAXS、XRD及相分析等方法,对经过相同轧制及热处理工艺的含Ti与无Ti低碳马氏体钢组织及冲击韧性进行分析对比.结果表明:含Ti钢经900℃油淬后,析出大量5～ 36 nm尺寸范围内的TiC.析出相有效钉扎晶界,马氏体组织得到显著细化,有效晶粒尺寸达到4.6 μm;同时TiC的大量析出还使得含Ti钢位错密度下降,弹性模量明显提高.经900℃油淬后,含Ti钢冲击韧性明显改善,冲击吸收功由无Ti钢的53 J大幅提高至265 J.
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