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本文对含Cu钢的Cu时效特征及其强化机理进行了研究。含Cu钢的硬度随时效时间和温度的变化,在500～550℃之间经1h左右的时效处理,硬度出现峰值,此时Cu的时效析出强化作用达到最大值;钢中添加0.80%以上的铜,通过时效处理使其在基体中析出细小弥散的ε-Cu颗粒,可使钢的强韧性得到较大提高。基于本文的研究,开发出了一种屈服强度高于590MPa、抗拉强度高于685MPa、-20℃冲击功超过160J,同时具有优良综合性能的新型铜时效钢。
In this paper, Cu-containing steel Cu aging characteristics and strengthening mechanism were studied. The hardness of Cu-containing steel increases with the aging time and temperature, and the peak value of hardness appears after aging at 500-550 ° C for about 1 h. At this time, the precipitation hardening effect of Cu reaches the maximum value. When adding 0.80% or more of Copper, aging treatment to make it in the matrix precipitated finely dispersed ε-Cu particles, can make the steel toughness is greatly improved. Based on the research in this article, a new type of copper aging steel with yield strength higher than 590MPa, tensile strength higher than 685MPa and -20 ℃ impact energy exceeding 160J has been developed.