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Gears and Springs in Niobium Microalloyed Steels for Automotive Applications

机译:用于汽车应用的铌微合金钢中的齿轮和弹簧

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The tensile strength levels required for spring and gear applications are far higher than those commonly associated with other uses of microalloyed steels. In addition, springs and gears are manufactured using highly specific processes. This is why we present first of all a brief overview of the context and objectives of these developments, in order to assess their scope. The work presented here confirms that the effects of Niobium are not simply those usually associated with the precipitation of Nb(CN) carbonitrides: inhibition of recrystallisation, control of austenitic grain coarsening and precipitation hardening. Account must also be taken of the interactions between the Nb and other elements, as well as the slowing down of γ => α + carbides transformation observed in certain cases. The number of mechanisms (or interactions) identified clearly shows why there is still a broad range of choices for optimising steel products and processes according to the target application, the production characteristics and the desired value for money ratios.
机译:弹簧和齿轮应用所需的拉伸强度水平远远高于与微合金钢的其他用途共同相关的抗拉强度水平。此外,使用高度具体的工艺制造弹簧和齿轮。这就是为什么我们首先介绍这些发展的背景和目标的简要概述,以评估其范围。这里提出的作品证实,铌的影响不仅仅是与Nb(CN)碳氮化物的沉淀有关的那些,包括碳氮化合物的抑制,奥氏体晶粒粗化和沉淀硬化的控制。还必须考虑在某些情况下观察到Nb和其他元素之间的相互作用,以及在某些情况下观察到γ=α+碳化物转化的速度。确定的机制数量(或交互)清楚地表明为什么仍然有广泛的选择,用于优化钢制产品和根据目标应用,生产特征和金钱比率的所需价值。

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