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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and mechanical properties of Ni-containing light-weight medium-Mn TRIP steel processed by intercritical annealing
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Microstructural evolution and mechanical properties of Ni-containing light-weight medium-Mn TRIP steel processed by intercritical annealing

机译：跨临界退火加工Ni含Ni轻质培养基跳闸钢的微观结构演化与力学性能

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摘要

Ni was deliberately added into a light-weight medium-Mn TRIP steel for further improving comprehensive mechanical properties through the precipitation of NiAl intermetallics. Ni addition results in the precipitation of 2-140 nm sized NiAl particles at phase boundaries and the interior of both austenite and ferrite, and more easily inside ferrite. Additionally, Ni addition benefits not only the increase of austenite fraction, ranging from 43% to 57%, but also the improvement of austenite stability because of the partition behavior of Ni from ferrite to austenite during annealing. Similar to Ni-free light-weight medium-Mn TRIP steels, martensitic transformation (TRIP effect) governed by austenite content and stability is the main deformation mechanism in the experimental steel. However, due to Ni addition, NiAl particles can increase yield strength through the precipitation strengthening. And the occurrence of twinning-induced plasticity (TWIP) effect has been confirmed, which contributes to the ductility. The present steel annealed at 680°C demonstrates high yield strength of 855 MPa, ultimate tensile strength of 961 MPa and superior total elongation of 53%, which is ascribed to the combined action of precipitation strengthening, strong TRIP effect and minor TWIP effect.
机译：将Ni刻意添加到轻型中Mn跳闸钢中，以通过Nial金属间质沉淀进一步改善综合机械性能。 Ni添加导致在相边界和奥氏体和铁氧体的内部的2-140nm大小颗粒的沉淀，更容易进入铁氧体。此外，Ni添加不仅有利于奥氏体馏分的增加，范围为43％至57％，也是由于在退火期间从铁氧体与奥氏体的Ni分配行为，奥氏体稳定性的提高。类似于无加重中Mn跳闸钢，由奥氏体含量和稳定性控制的马氏体转化（跳闸效应）是实验钢中的主要变形机制。然而，由于Ni另外，Nial颗粒可以通过沉淀强化增加屈服强度。已经证实了孪晶诱导的可塑性（TWIP）效应的发生，这有助于延展性。目前的钢在680℃下退火，表现出855MPa的高屈服强度，最终拉伸强度为961MPa，总伸长率为53％，归因于沉淀强化，强烈的跳闸效果强的组合作用，强烈的跳闸效果和微小的Twip效应。

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