We describe here for the first time the low temperature superplasticity of nanostructured low carbon steel (microalloyed with V, N, Mn, Al, Si, and Ni). Low carbon nanograined/ultrafine-grained (NG/UFG) bulk steel was processed using a combination of cold-rolling and annealing of martensite. The complex microstructure of NG/UFG ferrite and 50–80 nm cementite exhibited high thermal stability at 500 °C with low temperature elongation exceeding 100% (at less than 0.5 of the absolute melting point) as compared to the conventional fine-grained (FG) counterpart. The low temperature superplasticity is adequate to form complex components. Moreover, the low strength during hot processing is favorable for decreasing the spring back and minimize die loss.
展开▼
机译：我们在此首次描述了纳米结构低碳钢（与V，N，Mn，Al，Si和Ni微合金化）的低温超塑性。低碳纳米晶粒/超细晶粒（NG / UFG）大块钢是通过冷轧和马氏体退火相结合的方式进行加工的。 NG / UFG铁氧体和50-80 nm渗碳体的复杂微观结构在500 C的温度下具有很高的热稳定性，与传统的细晶粒（FG）相比，其低温延伸率超过100％（低于绝对熔点的0.5）。 ）对应对象。低温超塑性足以形成复杂的组件。此外，在热处理期间的低强度有利于减少回弹并使模具损失最小化。
展开▼
