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本文研究高强度合金结构钢30CrNi5MoV经520℃回火后的强韧化机理。数据分析表明,回火板条马氏体钢的强化机制服从Naylor模型和Langford-Cohen关系,屈服强度(σ_(0.2))可由下列公式描述本文用能量分析方法给出钢的脆断模型,推导出一个新的韧性—脆性转折温度公式该公式可表明显微组织和韧性关系。文中以定量金相为基础,用透射电镜测得钢中加入微量Nb后,在细化奥氏体晶粒的同时,又细化了板条,增大了孪晶量,缩小了棒状渗碳体的长度和间距,从而提高了钢的σ_(0.2)和K_(IC),但韧性—脆性转折温度(θ_(50)/50)略有升高。
In this paper, the toughening mechanism of high-strength alloy steel 30CrNi5MoV after tempering at 520 ℃ is studied. The data analysis shows that the strengthening mechanism of tempered lath martensite steel obeys the relationship between Naylor model and Langford-Cohen, and the yield strength (σ 0.2) can be described by the following formula. In this paper, the brittle fracture model of steel is given by energy analysis method, A new toughness - brittle transition temperature formula This formula shows the relationship between the microstructure and toughness. In this paper, based on the quantitative metallography, the transmission electron microscopy was used to measure the addition of trace Nb in the steel. The refinement of the austenite grains at the same time refined the slab, increased the amount of twins, reduced the rod-shaped carburization (0.2) and K (IC), but the ductile-brittle transition temperature (θ_ (50) / 50) increased slightly.