Pulsed GTAW joint of P92 steel and Inconel 625: microstructure and mechanical properties

IF 4.4 3区 工程技术 Q1 ENGINEERING, CIVIL
Sachin Sirohi, Amit Kumar, Manohar Singh, Dariusz Fydrych, Chandan Pandey
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引用次数: 0

Abstract

In the present work, the relationship between microstructure and mechanical properties has been investigated for the dissimilar welded joint of P92 steel and Inconel 625, fabricated using the pulsed current gas tungsten arc welding (GTAW) process. Microstructural investigation revealed that the pulsed current resulted in finer equiaxed dendrites in the bulk weld metal, while columnar dendrites were observed in the weld metal near the interface. A more uniform distribution of the fine secondary phases was observed in FESEM study. The EDS study of the inter-dendritic areas showed alloying element segregation throughout the weld metal, with higher density near the interface. This segregation led to the formation of secondary phases, specifically MC-type carbides (NbC, TiC), which was confirmed by the EDS analysis. The characterization of the interface between P92 steel and ERNiCrMo-3 filler weld revealed the presence of a filler-deficient zone, marked by features such as islands, peninsulas, and unmixed zones. Elemental diffusion and segregation of Nb, Mo, and Ti at the interface were also confirmed through EDS analysis. Tensile testing demonstrated acceptable tensile properties of the welded joint at room temperature, with a tensile strength of 764 ± 8 MPa and elongation of 33 ± 1%, with the sample failing from the P92 base metal. Significant hardness variations were observed along the welded joint, with the most notable changes occurring in the P92 heat-affected zone (HAZ). A maximum hardness of 420 HV was recorded in the coarse-grained HAZ of P92, while the inter-critical HAZ of P92 showed a minimum hardness of 215 HV. In addition, considerable hardness variation was noted within the weld metal, corresponding to each welding pass as well as across the transverse direction of the welded joint. The maximum and minimum hardness values in the weld metal were 261 ± 9 and 239 ± 13 HV, corresponding to the center and capping passes, respectively, with an average hardness of 250 HV. The Charpy toughness test also indicated acceptable results, with an impact energy value of 176 ± 8.5 J. The study also provides a detailed discussion on the relationship between microstructure and mechanical properties, highlighting how microstructural features influence the mechanical performance of the welded joint.

Abstract Image

P92钢与Inconel 625脉冲GTAW接头的组织与力学性能
本文研究了脉冲电流钨极气体保护焊(GTAW)工艺制备的P92钢与Inconel 625异种焊接接头的组织与力学性能的关系。显微组织研究表明,脉冲电流使焊缝整体金属中出现较细的等轴枝晶,而焊缝界面附近的焊缝金属中出现柱状枝晶。FESEM观察到细次相分布更为均匀。枝晶间区能谱分析表明,合金元素偏析贯穿整个焊缝金属,在界面附近密度较高。这种偏析导致了次生相的形成,特别是mc型碳化物(NbC, TiC), EDS分析证实了这一点。对P92钢与ERNiCrMo-3钎料焊缝界面的表征表明,钎料缺乏区存在,其特征为岛状、半岛状和未混合区。通过能谱分析证实了铌、钼和钛元素在界面处的扩散和偏析。拉伸试验表明,焊接接头在室温下具有良好的拉伸性能,抗拉强度为764±8 MPa,伸长率为33±1%,样品来自P92母材。焊接接头的硬度变化明显,其中P92热影响区(HAZ)的变化最为显著。P92粗晶HAZ最大硬度为420 HV,临界间HAZ最小硬度为215 HV。此外,焊接金属内部的硬度变化相当大,对应于每个焊接道次以及焊接接头的横向方向。焊缝金属硬度最大值为261±9 HV,最小值为239±13 HV,分别对应中心道和封盖道,平均硬度为250 HV。Charpy韧性试验也得到了可接受的结果,冲击能值为176±8.5 j。研究还详细讨论了微观组织与力学性能之间的关系,强调了微观组织特征对焊接接头力学性能的影响。
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来源期刊
Archives of Civil and Mechanical Engineering
Archives of Civil and Mechanical Engineering 工程技术-材料科学:综合
CiteScore
6.80
自引率
9.10%
发文量
201
审稿时长
4 months
期刊介绍: Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science. The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics. The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation. In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.
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