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首页> 外文期刊>Materials Science and Engineering >Influence of K-carbide precipitation on the microstructure and mechanical properties in the weld heat-affected zone in various FeMnAlC alloys
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Influence of K-carbide precipitation on the microstructure and mechanical properties in the weld heat-affected zone in various FeMnAlC alloys

机译：碳化钾沉淀对各种FeMnAlC合金焊缝热影响区组织和力学性能的影响

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This study aims to investigate the effects of kappa-carbide precipitation behavior in the heat affected zone (HAZ) in FeMnAlC lightweight steels. Three alloys with different amounts of Al were prepared by vacuum induction melting and hot rolling. After solution treatment, the HAZ samples were simulated by a Gleeble simulator with two heat inputs of 10 and 30 kJ/cm. Microstructural analysis with XRD and TEM were carried out while subsized tensile test, hardness test, and V-notched Charpy impact test were performed for investigating the mechanical properties of the base steels and HAZ. The results showed that the mechanical properties and precipitation of x-carbide within the HAZ were strongly related to the Al content and heat input; the tensile strength and hardness of the HAZ increased as the Al content and heat input increased while elongation decreased. On the other hand, in the Charpy impact test, fracture mode transitions in the HAZ (ranging from ductile fracture to brittle inter-granular fracture) occurred in accordance with the Al content and heat input. The different fracture behavior was explained by TEM results, which showed precipitation behavior of kappa-carbide in HAZ. Coherent intra-granular kappa-carbide was found to cause a transition from ductile fracture to trans-granular cleavage, and we observed that a severe drop of the impact toughness occurred when partially coherent inter-granular kappa-carbide appeared. Therefore, our results illustrate that the HAZ of lightweight steels with the proper Al content can be strengthened with minimal loss of impact toughness due to kappa-carbide precipitation during the welding process.
机译：这项研究旨在研究FeMnAlC轻钢在热影响区（HAZ）中卡伯碳化物的析出行为的影响。通过真空感应熔炼和热轧制备了三种含铝量不同的合金。固溶处理后，通过Gleeble模拟器模拟HAZ样品，两个热输入分别为10和30 kJ / cm。进行了XRD和TEM的显微组织分析，同时进行了亚尺寸拉伸试验，硬度试验和V型缺口夏比冲击试验，以研究基础钢和HAZ的力学性能。结果表明，热影响区内x-碳化物的力学性能和析出与Al含量和热量输入密切相关。随着Al含量和热输入的增加，HAZ的抗拉强度和硬度增加，而伸长率降低。另一方面，在夏比冲击试验中，根据Al含量和热输入，在热影响区中发生了断裂模式转变（从韧性断裂到脆性的晶间断裂）。 TEM结果解释了不同的断裂行为，显示了碳化物在热影响区中的沉淀行为。发现相干的颗粒内κ碳化物导致了从韧性断裂到跨颗粒的断裂转变，并且我们观察到当部分相干的颗粒间κ碳化物出现时，冲击韧性大大降低。因此，我们的结果表明，具有适当Al含量的轻质钢的热影响区可以在焊接过程中因卡帕碳化物沉淀而导致的冲击韧性损失最小的情况下得到增强。

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