On the Heat-Affected Zone Role for Mechanical Properties of Structural-Steel MIG and CMT–MIG Weldments

IF 1.6 4区材料科学 Q2 Materials Science

Transactions of The Indian Institute of Metals Pub Date : 2024-09-03 DOI:10.1007/s12666-024-03460-3

Akhil Khajuria, Anurag Misra, S. Shiva

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Abstract

The effect of evolved heat-affected zone (HAZ) during metal inert gas (MIG) and cold metal transfer (CMT)–MIG welding of two IS2062 structural-steels, i.e. E250 and E410, was studied. The comparison of mechanical properties such as yield strength, ultimate tensile strength, tensile ductility being represented by %elongation, impact toughness at room temperature, and microhardness was done. Conventional optical and field-emission scanning electron microscopy were used for detailed examination of microstructural evolution across weldments. CMT–MIG in comparison to MIG mode was observed to produce a well-refined microstructure for both E250 and E410. Various HAZ subzones comprised of fully formed pearlite colonies in coarse-grain HAZ, pearlite in patched form in fine-grain HAZ, partially distributed pearlite in inter-critical HAZ, and fine Widmanstätten and acicular ferrite in deposited weld-metal of ER-70S6. Such microstructural manifestations particularly in HAZ subzones exhibited a positive effect leading to improved mechanical performance.

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论热影响区对结构钢 MIG 焊缝和 CMT-MIG 焊缝机械性能的作用

研究了两种 IS2062 结构钢材（即 E250 和 E410）在金属惰性气体（MIG）和冷金属转移（CMT）-MIG 焊接过程中热影响区（HAZ）演化的影响。比较了屈服强度、极限抗拉强度、拉伸延展性（以伸长率表示）、室温冲击韧性和显微硬度等机械性能。使用传统光学显微镜和场发射扫描电子显微镜对焊接件的微观结构演变进行了详细检查。与 MIG 模式相比，CMT-MIG 对 E250 和 E410 产生的微观结构都非常精细。各种热影响区子区包括粗晶粒热影响区中完全形成的珠光体菌落、细晶粒热影响区中斑块状的珠光体、临界热影响区间部分分布的珠光体，以及 ER-70S6 熔敷焊材中细小的维德曼泰滕和针状铁素体。这些微观结构表现，尤其是在热影响区子区的表现，对提高机械性能具有积极作用。

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来源期刊

Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys

CiteScore

2.60

自引率

6.20%

发文量

期刊介绍： Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.