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首页> 外文期刊>Materials Science and Engineering >Effect of martensite volume fraction on the mechanical behavior of an UNS S41003 dual-phase stainless steel
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Effect of martensite volume fraction on the mechanical behavior of an UNS S41003 dual-phase stainless steel

机译：马氏体体积分数对未S41003双相不锈钢力学行为的影响

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摘要

UNS S41003 (410D) steel is a relatively low chromium unstabilized ferritic stainless steel. It has superior mechanical and corrosion resistance than ordinary low carbon steels. Therefore, and for its relatively low cost among specialty steels, it is a strong candidate for replacement of low carbon common steels in many applications. In order to enable new applications for this steel, it is important to ensure good performance in relation to its mechanical strength, so the development of hardening mechanisms without significant loss of ductility is desirable. Dual-phase microstructures are an example that fits in this context, because they tend to increase mechanical strength and are favorable to the fracture toughness and fatigue resistance of steels. This research evaluated the influence of quenching heat treatments after intercritical austenitizing on the microstructure, tensile strength, hardness, fracture toughness (J x Aa curves) and fatigue crack growth resistance (da/dN x ΔK curves) of a 410D ferritic stainless steel. The used intercritical austenitization temperatures were defined based on its critical temperatures A_(c1) and measured by dilatometry. Ten different quenching heat treatments were performed, varying the austenitizing temperature and time, in order to obtain dual-phase microstructures (ferrite and martensite) with different volume fractions of constituents. The obtained results revealed that the increase of the austenitizing temperature and time favor the increase of the martensite volume fraction in the microstructure. Higher martensite volume fractions imply greater hardness and mechanical tensile and fatigue strength of the steel, but with loss of ductility and fracture toughness. The best balance among the studied mechanical properties was presented by steel treated at 825 °C for 15min, containing 57% of martensite.
机译：UNS S41003（410D）钢是一种相对较低的铬不稳定铁素体不锈钢。它具有比普通的低碳钢的卓越机械和耐腐蚀性。因此，在特殊钢材中的成本相对较低，它是在许多应用中更换低碳普通钢的强大候选者。为了使该钢材的新应用，重要的是确保与其机械强度有关的良好性能，因此希望在没有显着延展性损失的情况下开发硬化机制。双相微结构是拟合在这种情况下的一个例子，因为它们倾向于增加机械强度，并且有利于钢的断裂韧性和疲劳性。该研究评估了在410D铁素体不锈钢的微观结构，拉伸强度，硬度，断裂韧性（J X AA曲线）和疲劳裂纹生长阻力（J X AA曲线）的跨临界奥氏体后淬火热处理后的影响。基于其临界温度A_（C1）并通过稀释测量来定义使用的跨临界奥氏体化温度。进行十种不同的猝灭热处理，改变奥氏体化温度和时间，以获得具有不同体积分数的双相微结构（铁氧体和马氏体）。所得结果表明，奥氏体化温度和时间的增加赞成微观结构中马氏体体积分数的增加。更高的马氏体体积分数意味着钢的硬度和机械拉伸和疲劳强度更大，但延展性损失和断裂韧性。通过在825℃下处理的钢，含有57％的马氏体，通过钢呈现研究的机械性能中的最佳平衡。

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