Regularities of structure modification of 09Mn2Si steel rod at helical rolling and its influence on impact toughness

I. Vlasov, N. Surikova, I. Mishin, S. Panin, A. Smirnova, A. Yakovlev
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Abstract

Effect of structure modification induced by the helical rolling on the impact toughness of 09Mn2Si steel was studied. A metallographic structural analysis of the steel in the as-received state as well as after the helical rolling (HR) was carried out. It was revealed that the five-stage combined thermal-mechanical treatment results in ferrite grains refinement, formation of rolling texture at the depth of up to 1 mm, while ultrafine grained structure is formed in the surface layer. This is accompanied by a gradient hardening pattern over the rod’s cross-section as evidenced from microhardness measurements. Mechanical properties were assessed through impact bending tests. It is shown that helical rolling gives rise to increasing fracture toughness of the rolled specimens in the entire testing temperature range (-70 ÷ +20 °C). The maximum two-fold increase of impact toughness is registered at the testing temperature of -70 °C. Authors suggest that the main reason for this increase is formation of a gradient...
09Mn2Si钢棒材螺旋轧制组织变化规律及其对冲击韧性的影响
研究了螺旋轧制诱导的组织改性对09Mn2Si钢冲击韧性的影响。对钢在接收状态和螺旋轧制后的金相组织进行了分析。结果表明:五段复合热处理使铁素体晶粒细化,在深度达1 mm处形成轧制织构,表层形成超细晶组织;这是伴随着一个梯度硬化模式在棒的横截面,证明了从显微硬度测量。通过冲击弯曲试验评估了机械性能。结果表明,在整个试验温度范围内(-70℃~ +20℃),螺旋轧制试样的断裂韧性均有提高。在-70°C的测试温度下,冲击韧性最大增加了两倍。作者认为,这种增加的主要原因是形成了一个梯度……
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