The relation between microstructure and mechanical properties of carbide-free bainitic steel 0.2% C – 1.53% Mn – 1.1% Si – 1% Cr – 0.3% Mo – 0.5% N under thermomechanical treatment is studied under isothermal conditions and under continuous air cooling. Impact tests of Charpy specimens, metallographic and x-ray diffraction analyses of the steel deformed by different variants are conducted. The size of the initial austenite grains and the Vickers hardness of the steel are determined. The hot plastic deformation is shown to affect positively the impact toughness of the steel treated for bainite.

中文翻译：

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无碳化物贝氏体钢的热机械处理

研究了等温条件和连续空冷条件下，无碳化物贝氏体钢 0.2% C – 1.53% Mn – 1.1% Si – 1% Cr – 0.3% Mo – 0.5% N 的组织与力学性能的关系。进行了夏比试样的冲击试验、由不同变体变形的钢的金相和 X 射线衍射分析。确定初始奥氏体晶粒的尺寸和钢的维氏硬度。表明热塑性变形对贝氏体处理钢的冲击韧性有积极影响。