Microstructural and Mechanical Characterization of Ti‐Containing Twinning‐Induced Plasticity Steel Welded Joint Produced by Gas Tungsten Arc Welding Process,Steel Research International

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Microstructural and Mechanical Characterization of Ti‐Containing Twinning‐Induced Plasticity Steel Welded Joint Produced by Gas Tungsten Arc Welding Process
Steel Research International ( IF 1.9 ) Pub Date : 2020-06-02 , DOI: 10.1002/srin.202000129
Humberto Hernández-Belmontes ₁ , Ignacio Mejía ₁ , José Antonio Benito ₂ , José María Cabrera _{1,

2}

Affiliation

The aim herein is to study the microstructural and mechanical changes generated in a welded joint of Ti‐containing twinning‐induced plasticity (TWIP) steel by the gas tungsten arc welding (GTAW) process. For this purpose, the welding parameters that allow the union of 5.6 mm‐thick butt plates with full penetration and without filler material are investigated. Microstructural changes are examined by light optical metallography. Segregation and second‐phase precipitated particles are investigated by scanning electron microscopy and electron‐dispersive spectroscopy. Phase transformations are evaluated using X‐ray diffraction. Finally, the mechanical behavior is assessed by Vickers microhardness and microtensile tests. In general, the welded joint shows dendritic structure formations in the fusion zone (FZ) and equiaxed grain growth in the heat‐affected zone (HAZ). The FZ shows a high degree of segregation, where Mn, Si, and C segregate in the interdendritic regions, whereas Al preferentially segregates in dendritic areas. In contrast, no effect on austenite stability is noticed. The welded joint shows an increase in microhardness, which is associated with the formation of precipitated particles. Finally, the microtensile results show a decrease in ultimate tensile strength (UTS) in the FZ, whereas the welding interface and HAZ show an increase in UTS compared with the base material.

中文翻译：

钨极氩弧焊生产含钛孪晶诱导塑性钢焊接接头的组织和力学性能

本文的目的是研究通过钨极氩弧焊（GTAW）工艺在含钛双晶诱导塑性（TWIP）钢的焊接接头中产生的显微组织和机械变化。为此目的，研究了焊接参数，该参数允许对5.6毫米厚的对接板进行全焊透且不使用填充材料。显微组织的变化通过光学金相观察。通过扫描电子显微镜和电子弥散光谱研究偏析和第二相沉淀颗粒。使用X射线衍射评估相变。最后，通过维氏显微硬度和显微拉伸试验评估机械性能。一般来说，焊接接头在熔合区（FZ）中显示出树枝状结构，而在热影响区（HAZ）中显示了等轴晶粒生长。FZ表现出高度的偏析，其中Mn，Si和C偏析在树突间区域中，而Al偏析于树突区域中。相反，未观察到对奥氏体稳定性的影响。焊接接头的显微硬度增加，这与沉淀颗粒的形成有关。最后，微拉伸结果表明FZ的极限抗拉强度（UTS）降低，而与基础材料相比，焊接界面和HAZ的UTS升高。没有观察到对奥氏体稳定性的影响。焊接接头的显微硬度增加，这与沉淀颗粒的形成有关。最后，微拉伸结果表明FZ的极限抗拉强度（UTS）降低，而焊接界面和HAZ与基础材料相比则表明UTS升高。没有观察到对奥氏体稳定性的影响。焊接接头的显微硬度增加，这与沉淀颗粒的形成有关。最后，微拉伸结果表明FZ的极限抗拉强度（UTS）降低，而焊接界面和HAZ与基础材料相比则表明UTS升高。

更新日期：2020-06-02

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