ABSTRACT

Cold rolling test as well as room temperature compression was carried out to investigated the influence of Mn content on the cold deformation properties of lean duplex stainless steel. The cold deformation mechanism was also discussed by observation of cold-rolled samples with cracks and analysis of the work hardening curve. The results demonstrated that the morphology and size of grains were both influenced by the Mn content. The quenched martensite content varied with Mn content, indicating that Mn plays critical role in both the difficulty of stress-induced martensite transformation of austenite grains in LDSS and the transformation process from austenite to martensite during solution treatment. LDSS with a lower Mn content exhibits lower austenite stability. After quenching, plenty of the austenite was transformed into martensite which performs much higher hardness than ferrite. With the increase in hardness difference between phases, the plasticity of the alloys decreased caused by each phase bore more uneven deformation.

摘要

通过冷轧试验和室温压缩试验研究了Mn含量对贫双相不锈钢冷变形性能的影响。通过对冷轧带裂纹试样的观察和加工硬化曲线的分析，探讨了冷变形机理。结果表明，晶粒的形貌和尺寸均受锰含量的影响。淬火马氏体含量随 Mn 含量的变化而变化，表明 Mn 在 LDSS 中奥氏体晶粒应力诱导马氏体相变的困难和固溶处理过程中奥氏体向马氏体的相变过程中起着关键作用。具有较低 Mn 含量的 LDSS 表现出较低的奥氏体稳定性。淬火后，大量的奥氏体转变为马氏体，其硬度远高于铁素体。随着相间硬度差的增大，合金的塑性下降，各相内孔变形更加不均匀。