Abstract The paper analyzes the nucleation and growth of bainite in low-carbon low-alloy 09Mn2Si steel doped with titanium carbonitride nanoparticles in impact toughness testing. The analysis shows that such particles segregate at low-angle boundaries, retarding the formation of high-angle ones, and when impacted into the steel, they curve the lattice and generate a new bainite phase at the curvature interstices. The mechanism of bainite nucleation and growth is sympathetic, obeys the angular momentum conservation law, and provides the formation of multilayered packets of bainite plates capable for unlimited thinning to sub-sub-subunits during deformation. Such bainite plates can respond to their stress-strain state by one or another rotation, showing a high relaxation capacity and providing a high impact toughness of the steel at low temperatures.

中文翻译：

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延展性和断裂韧性同时增加的低碳低合金钢的硬化机制

摘要 研究了碳氮化钛纳米粒子掺杂低碳低合金09Mn2Si钢中贝氏体在冲击韧性试验中的形核和长大情况。分析表明，这些颗粒在低角度边界处偏析，阻碍了高角度边界的形成，当撞击到钢中时，它们会使晶格弯曲并在曲率间隙处生成新的贝氏体相。贝氏体成核和生长的机制是交感的，遵守角动量守恒定律，并提供多层贝氏体板包的形成，能够在变形过程中无限减薄到亚亚单位。这种贝氏体板可以通过一次或另一次旋转来响应其应力应变状态，显示出高松弛能力并在低温下提供钢的高冲击韧性。