δ铁素体对马氏体钢冲击性能的影响

Effect of δ Ferrite on Impact Properties of Martensitic Steel

研究了δ铁素体对马氏体钢冲击性能以及合金元素分布规律的影响。结果表明,马氏体钢中的Nb、V、Si元素促进δ铁素体形成,C、Cu、Mn、N元素则会降低δ铁素体含量。δ铁素体集中在材料原奥氏体的晶界位置,将大大降低材料的力学性能。在原奥氏体内部形成的δ铁素体周围会聚集大量Nb元素,这会减少MX相的生成,大大降低材料韧性。

The effects of δ ferrite on the impact properties of martensitic steel and distribution law of alloying element were investigated. The results show that the element Nb, V, and Si can promote the formation of δ ferrite, but the element C, Cu, Mn and N will reduce the content of δ ferrite. The δ ferrite concentrates at original austenite grain boundary, which will deteriorate the mechanical properties of the steel. And a large amount of elements Nb concentrates around δ ferrite inside the original austenite, which reduces the phase MX, and thus the toughness of the steel decreases.