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一、序言 近半个世纪来,人们对钢的回火脆性进行了大量的研究。钢的可逆回火脆性是马氏体回火(350～550℃)时产生的脆性。当淬火钢在较高温度下回火后,以缓慢的速度冷却通过该温度区间,或在该温度区间内长时间保温,或淬火钢直接在该温度区间内回火,导致钢的韧性显著降低,韧脆转变温度大大提高,断口上出现沿晶断裂特征。研究表明,可逆回火脆性是杂质元素(P、Sn、Sb、As等)和合金元素(Ni、Cr、Mn、Si等)相互作用,而向原始奥氏体晶界平衡偏聚的结果。
First, the preface For nearly half a century, people on the temper brittleness of steel conducted a lot of research. The reversible temper brittleness of steel is the brittleness caused by martensite tempering (350-550 ° C). When the quenched steel after tempering at a higher temperature, the slow cooling rate through the temperature range, or a long time in the temperature range insulation, or quenched steel directly in the temperature range of tempering, resulting in significant reduction in the toughness of steel , Ductile-brittle transition temperature is greatly increased, along the fracture fracture characteristics. The results show that the reversible temper embrittlement is the result of the segregation of the impurity elements (P, Sn, Sb, As, etc.) and the alloying elements (Ni, Cr, Mn, Si, etc.) in equilibrium with the original austenite grain boundaries.