Influence of buttering layers on the microstructural evolution and mechanical behavior of Incoloy 800HT and P91 steel welded joint

IF 4.4 3区工程技术 Q1 ENGINEERING, CIVIL

Archives of Civil and Mechanical Engineering Pub Date : 2024-09-15 DOI:10.1007/s43452-024-01044-y

Vishwa Bhanu, Kalpana Gupta, R. Saravanakumar, Ankur Gupta, Chandan Pandey

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Abstract

This study delves into the microstructure and mechanical properties of a dissimilar metal weld (DMW) joining Incoloy 800HT and P91 steel. The P91 was buttered with Inconel 82 (ERNiCr-3) filler layers, and the final DMW weld was fabricated using Inconel 617 (ERNiCrCoMo-1) filler. Weld interface regions were characterized using electron backscatter diffraction (EBSD) and scanning electron microscopy. EBSD uncovered unique microstructural characteristics across the DMW. Extensive investigation was conducted on the heat-affected zone (HAZ) of Incoloy 800HT, revealing a consistently stable austenitic microstructure characterized by random grain orientations. Nevertheless, the weld fusion zone (WFZ) exhibits an intricate microstructure characterized by dendrites that extend into packets. The WFZ and the buttering layer interaction exhibited a predominantly face-centered cubic (FCC) structure. Recrystallization was indicated in this region. During tensile testing, the DMW specimens experienced failures at different locations and exhibited varying mechanical properties. A standard specimen made of Incoloy 800HT base metal experienced failure during welding. The DMW exhibited a maximum ultimate tensile strength (UTS) of 671 MPa and a yield strength (YS) of 234 MPa. The buttering process helped avoid the post-weld heat treatment to a certain extent. A maximum of 98 ± 5 J Charpy impact toughness was observed in the WFZ of the DMW failing in a complete ductile mode.

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涂黄油层对 Incoloy 800HT 和 P91 钢焊接接头微观结构演变和机械性能的影响

本研究深入探讨了连接 Incoloy 800HT 和 P91 钢的异种金属焊缝 (DMW) 的微观结构和机械性能。P91 钢使用 Inconel 82（ERNiCr-3）填料层涂抹黄油，最后的 DMW 焊缝使用 Inconel 617（ERNiCrCoMo-1）填料制造。使用电子反向散射衍射 (EBSD) 和扫描电子显微镜对焊接界面区域进行了表征。EBSD 发现了整个 DMW 独特的微观结构特征。对 Incoloy 800HT 的热影响区（HAZ）进行了广泛的研究，发现了以随机晶粒取向为特征的持续稳定的奥氏体微观结构。然而，焊接熔合区（WFZ）却呈现出复杂的微观结构，其特点是树枝状晶粒延伸成包。WFZ 和黄油层的相互作用主要表现为面心立方（FCC）结构。该区域存在再结晶现象。在拉伸测试过程中，DMW 试样在不同位置出现了失效，并表现出不同的机械性能。由 Incoloy 800HT 母材制成的标准试样在焊接过程中出现故障。DMW 的最大极限拉伸强度 (UTS) 为 671 兆帕，屈服强度 (YS) 为 234 兆帕。涂黄油工艺在一定程度上避免了焊后热处理。在以完全韧性模式失效的 DMW 的 WFZ 中观察到最大 98 ± 5 J 的夏比冲击韧性。

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来源期刊

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.