The Effects of Post Weld Heat Treatment on Microstructure and Mechanical Properties of API X70 Linepipe using Submerged Arc Welding

• Autorzy: Park Minha , Lee Gang Ho , Jang Gwangjoo , Kim Hyoung-Chan , Kim Byoungkoo , Kim Byung Jun

Identyfikatory

DOI

10.24425/amm.2024.147794

• Języki publikacji: EN

Abstrakty

EN

API X70 steel requires high strength and toughness for safety in extreme environments like high pressure and low temperature. Submerged Arc Welding (SAW ) is effective for manufacturing thick steel pipes. However, the welding heat input during SAW alters the microstructure and mechanical properties of the heat affected zone (HAZ). Therefore, investigating the correlation between microstructure and mechanical properties in welded X70 pipes is important to address potential degradation of HAZ and weld metal (WM). In this study, post weld heat treatment (PWHT) was performed to improve mechanical properties of HAZ and WM and to reduce residual stress caused by the welding process. We performed PWHT at 640°C for 15 hours and followed by air cooling. After heat treatment, we observed the microstructure through OM and SEM analysis, and investigated the mechanical properties through tensile test, hardness test, and Charpy impact test.

Słowa kluczowe

EN

API X70; post weld heat treatment; PWHT; submerged arc welding; SAW; mechanical properties

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 1
• Strony: 99--102
• Opis fizyczny: Bibliogr. 8 poz., fot., rys., tab.

Twórcy

autor

Park Minha

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0001-6229-185X

autor

Lee Gang Ho

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea
• Pukyong National University, Department of Materials Science and Engineering, 48513, Busan, Republic of Korea

• https://orcid.org/0009-0006-6166-6166

autor

Jang Gwangjoo

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0009-0009-0846-2676

autor

Kim Hyoung-Chan

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0009-0004-5906-7039

autor

Kim Byoungkoo

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-5392-5862

autor

Kim Byung Jun

• Energy System Grou, Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-7205-0045

Bibliografia

• [1] H.L. Kim, S.H. Bang, J.M. Choi, N.H. Tak, S.W. Lee, S.H. Park, Effect of rolling and coiling temperatures on Microstructure and Mechanical Properties of Medium-Carbon Pipeline Steel. Met. Mater. Int. 26, 1757-1765 (2020).
• [2] S.Y. Shin, B. Hwang, S. Lee, N.J. Kim, S.S. Ahn, Correlation of Microstructure and Charpy impact Properties in API X70 and X80 Line-pipe Steels. Mater. Sci. Eng. A. 458 (1-2), 281-289 (2007).
• [3] J.-H. Kim, S.-W. Choi, D.-H. Park, J.-M. Lee, Charpy Impact Properties of Stainless Steel Weldment in Liquefied Natural Gas Pipelines: Effect of Low Temperatures. Mater. Des. 65, 914-922 (2015).
• [4] S.-W. Lee, S.-I. Lee, B. Hwang, Effect of Bainitic Microstructure on Low-Temperature Toughness of High-Strength API Pipeline Steels. Korean. J. Met. Mater. 58 (5), 293-303 (2020).
• [5] H. Alipooramirabad, A. Paradowska, S. Nafisi, M. Reid, R. Ghomashchi, Post-weld Heat Treatment of API 5L X70 High Strength Low alloy Steel Welds. Materials 13 (24), 5801-5824 (2020).
• [6] D.-H. Yang, G.-S. Ham, S.-H. Park, K.-A. Lee, Effect of stress relieving heat treatment on tensile and impact toughness properties of AISI 316L alloy manufactured by selective laser melting process. J. Powder Mater. 28 (4), 301-309 (2021).
• [7] W.S.H. W. Muda, N.S.M. Nasir, S. Mamat, S. Jamian, Effect of Welding Heat Input on Microstructure and Mechanical Properties at Coarse Grain Heat Affected Zone of ABS grade a Steel. Materials. ARPN J. Eng. Appl. Sci. 10 (20), 9487-9495 (2015).
• [8] H.K. Sung, S.S. Sohn, S.Y. Shin, K.S. Oh, S. Lee, Metal. Effects of Oxides on Tensile and Charpy Impact Properties and Fracture Toughness in Heat Affected Zones of Oxide-Containing APi X80 Linepipe Steels. Mater. Trans. A. 45, 3036-3050 (2014).

Uwagi

This study was supported by the R&D Program of the “the International joint technology development project (P0019244, Development of eco-friendly high-performance forged parts manufacturing technology based on AI intelligent plastic processing system).