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Ultrafine Grained Low Carbon Steels Processed by Severe Plastic Deformation

机译：严重塑性变形处理的超细晶粒低碳钢

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摘要

The structure, mechanical and functional properties of ultrafine-grained low-carbon steels have been studied after severe plastic deformation (SPD) by high pressure torsion (HPT) and equal-channel angular pressing (ECAP). It is revealed that HPT of low carbon steels at a temperature below 0.3 T_m leads to the formation of nanocrystalline structure with a grain size of <100 nm or a mixture of oriented substructure and nanograins. ECAP under similar conditions leads to the formation of submicrocrystalline structure with a grain size of 200-300 nm. The initial martensitic state compared with the initial ferritic-pearlitic state of the low-carbon steels results in formation of finer structure after SPD and less intense grain growth upon heating, i.e., results in a higher thermal stability. Low-carbon low-alloy steels after ECAP are characterized by high strength (UTS > 1000 MPa) and plasticity (EL = 10-15%). The high-strength state after ECAP is retained upon tensile test testing up to a temperature of 500°C. The submicrocrystalline low-carbon steels after ECAP processing and subsequent heating is characterized by an increased impact toughness at test temperatures down to -40℃.
机译：在高压扭力（HPT）和等通道角向压制（ECAP）导致严重塑性变形（SPD）之后，已经研究了超细晶低碳钢的结构，力学和功能性能。结果表明，低碳钢的HPT在低于0.3 T_m的温度下会导致形成晶粒尺寸小于100 nm的纳米晶体结构或取向亚结构和纳米晶粒的混合物。在相似的条件下，ECAP导致形成晶粒尺寸为200-300 nm的亚微晶结构。与低碳钢的初始铁素体-珠光体状态相比，初始马氏体状态导致SPD后形成更细的组织，加热时晶粒强度降低，即导致更高的热稳定性。 ECAP后的低碳低合金钢具有高强度（UTS> 1000 MPa）和可塑性（EL = 10-15％）的特点。 ECAP后的高强度状态在拉伸试验测试中保持到500°C。经过ECAP处理和随后加热的亚微晶低碳钢的特点是，在低至-40℃的测试温度下，冲击韧性得以提高。

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