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首页> 外文期刊>Materials Science and Engineering >Improving the strength and ductility of reduced activation ferritic/martensitic steel by cold-swaging and post-annealing
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Improving the strength and ductility of reduced activation ferritic/martensitic steel by cold-swaging and post-annealing

机译：通过冷拔和后退火处理，提高还原活化铁素体/马氏体钢的强度和延展性

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摘要

A new process to produce ultrafine-grained reduced activation ferritic/martensitic steel was developed by cold-swaging and post-annealing. Microstructural examinations showed that the martensitic structures were broken into subgrain structures, and the rod-like carbides were fragmented after cold-swaging process with the cumulative strain of ～ 2.8. The tensile strength significantly increased accompanied by a reduction in the ductility in the cold-swaged samples, which was due to the insufficient strain hardening ability. After post-annealing at 973 K, a stable ultrafine-grained structure with uniformly distributed nanoprecipitates was obtained. The presence of uniformly distributed nanoprecipitates not only provided an effective precipitation strengthening but also improved the strain hardening ability, resulting in higher strength and better ductility than their as-tempered counterparts.
机译：通过冷弯和后退火，开发了一种生产超细晶粒还原活化铁素体/马氏体钢的新工艺。显微组织检查表明，马氏体组织被破碎成亚晶粒结构，并且棒状碳化物在冷拔后经过破碎，其累积应变约为2.8。拉伸强度显着增加，同时冷锻样品的延展性降低，这是由于应变硬化能力不足所致。在973 K进行后退火后，获得具有均匀分布的纳米沉淀的稳定的超细晶粒结构。均匀分布的纳米析出物的存在不仅提供了有效的沉淀强化，而且还改善了应变硬化能力，与回火后的对应物相比，具有更高的强度和更好的延展性。

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