The microstructure and fracture mode of physically simulated heat-affected zones of a weld metal used with 500 MPa offshore steel – part 1: impact toughness test results

Procedia Structural Integrity Pub Date : 2025-01-01 DOI:10.1016/j.prostr.2025.06.088

Marcell Gáspár , Judit Kovács , Henri Tervo , Antti Kaijalainen , Vahid Javaheri , Johannes Sainio , Jukka Kömi

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Abstract

Offshore steels are developed to have excellent toughness to withstand harsh conditions needed in applications such as offshore oil-drilling platforms, wind power turbines and ships. The heat-affected zones (HAZ) are widely studied but there is less information about the changes in weld metal during multipass welding. In this study the microstructures and impact energy values in the physically simulated HAZ subzones of the weld metal were analysed: coarse-grained (CGHAZ-W) and intercritical (ICHAZ-W) zones. Subzones with 3 different cooling times (t_8/5 = 5, 15 and 30 s) were simulated using Gleeble 3500 simulator. The increase of cooling time slightly reduced the hardness in the subzones. The impact energy values of subzones were below the unaffected weld metal but safely above the required value of the base material standard. Ductile and ductile/brittle behavior were observed. Longer cooling time resulted lower impact energy in ICHAZ-W, however this tendency was not observed in CGHAZ-W.

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500mpa海上用钢焊接金属热影响区的物理模拟显微组织和断裂模式。第1部分：冲击韧性试验结果

海洋用钢具有优异的韧性，可以承受海上石油钻井平台、风力涡轮机和船舶等应用所需的恶劣条件。热影响区（HAZ）研究广泛，但对焊缝金属在多道次焊接过程中的变化了解较少。在本研究中，分析了焊接金属物理模拟HAZ亚区：粗晶区（chaz - w）和临界间区（ICHAZ-W）的显微组织和冲击能值。采用Gleeble 3500模拟机对3种不同冷却时间（8/5 = 5、15和30 s）的分区进行了模拟。随着冷却时间的延长，各亚区硬度略有降低。分区的冲击能值低于未受影响的焊接金属，但安全高于基材标准的要求值。观察到韧性和韧性/脆性行为。冷却时间越长，ICHAZ-W的冲击能越低，而chaz - w则没有这种趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Procedia Structural Integrity

CiteScore

1.70

自引率

0.00%

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