Study on the microstructure and tensile properties of GH5188 high-temperature alloy laser welded joints
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W.-Q. Song
Wen-Qing Song (1975-), Male, Doctor, Researcher, Research focus: Research and development of new materials, new processes and new technologies for welding aircraft engine parts.Xin Wang (1990-), Male, Doctor, Lecturer, Research focus: Weldability and surface engineering technology of metal materials.
,
G.-D. Liu
Abstract
GH5188 high-temperature alloy has excellent mechanical properties and oxidation resistance and is used in the aerospace field and other harsh working environments. Tension and creep are the main failure modes during component operation. Hence, this work systematically characterizes and discusses the microstructure and properties of the welded joints. The results indicate that the weld metal of GH5188 alloy is mainly composed of long columnar grains, equiaxed dendrites, and carbides in a stable microstructure. Welding heat-affected zone grains are dominated by austenitic grains. Carbides are mainly divided into the two types M6C and M23C6, widely distributed in the weld and heat-affected zone on the grain boundary. The microstructure after the tensile fracture was tested, and the main cause for the fracture of the joint was found to be carbide in the weld structure. The average ultimate tensile strength for the laser welded joints at room temperature is 936.7 MPa and the average elongation after fracture is 19.25 %. The welded joint sample was kept at a temperature of 927 °C with a fixed load of 76 MPa for 36 hours without fracture. In this work, the requirements of relevant enterprises could be met and theoretical support for practical applications could be provided.
Kurzfassung
Die hochwarmfeste Legierung GH5188 bietet hervorragende mechanische Eigenschaften und Oxidationsbeständigkeit und kommt im Bereich Luft- und Raumfahrt sowie in anderen rauen Arbeitsumgebungen zum Einsatz. Hauptversagensmechanismen im Bauteilbetrieb sind Spannungen und Kriechen. In diesem Beitrag werden daher das Gefüge und die Eigenschaften der Schweißverbindungen systematisch charakterisiert und erörtert. Die Ergebnisse zeigen ein sich im Wesentlichen aus langen kolumnaren Körnern, gleichachsigen Dendriten und Karbiden in einem stabilen Gefüge zusammensetzendes Schweißgut der Legierung GH5188. In der Wärmeeinflusszone dominieren austenitische Körner. Karbid wird hauptsächlich in die zwei Typen M6C und M23C6 unterteilt. Diese sind in der Schweiß- und Wärmeeinflusszone an der Korngrenze weit verbreitet. Nach dem Zugbruch wurde das Gefüge untersucht. Als Hauptursache des Bruchs der Schweißnaht wurde im Gefüge der Schweißnaht auftretendes Karbid identifiziert. Die durchschnittliche Zugfestigkeit der lasergeschweißten Verbindungen beträgt bei Raumtemperatur 936,7 MPa, die durchschnittliche Bruchdehnung 19,25 %. Die Probe der Schweißverbindung wurde 36 Stunden lang bei 927 °C mit einer konstanten Last von 76 MPa beaufschlagt, ohne dass es zu einem Bruch kam. Im Rahmen dieses Beitrags konnten die Anforderungen der entsprechenden Unternehmen erfüllt und theoretische Unterstützung für praktische Anwendungen geboten werden.
About the authors
Wen-Qing Song (1975-), Male, Doctor, Researcher, Research focus: Research and development of new materials, new processes and new technologies for welding aircraft engine parts.
Xin Wang (1990-), Male, Doctor, Lecturer, Research focus: Weldability and surface engineering technology of metal materials.
5 Acknowledgments
All the works were funded by the National Science and Technology Project (J2019-VII-0012).
5 Danksagung
Alle Arbeiten wurden im Rahmen des National Science and Technology Project (J2019-VII-0012) finanziert.
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Articles in the same Issue
- Inhalt
- Editorial
- Editorial
- How can stainless CrNi steel be etched to clearly characterize the individual phases?
- Study on the microstructure and tensile properties of GH5188 high-temperature alloy laser welded joints
- Characterization of an electric resistance welded steel plate
- Failure Analysis
- Failure of an impeller blade of a first stage air compressor
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
Articles in the same Issue
- Inhalt
- Editorial
- Editorial
- How can stainless CrNi steel be etched to clearly characterize the individual phases?
- Study on the microstructure and tensile properties of GH5188 high-temperature alloy laser welded joints
- Characterization of an electric resistance welded steel plate
- Failure Analysis
- Failure of an impeller blade of a first stage air compressor
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
