Contribution to the Fracture Mechanics Characterization of Repair Welding of Thick-Walled Ductile Cast Iron Components

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Peter Trubitz, Steffen Grützner, Lutz Krüger
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Abstract

For the spheroidal graphite cast iron materials, also known as ductile cast iron (DCI), EN-GJS-400-18-LT and EN-GJS-450-18, different welding procedures were examined for potential repair welding. A repair weld was performed on thick cast iron plates using the optimum procedure in each case. The weld was evaluated for all areas of the welded joint (weld metal, fusion line/heat-affected zone and base metal). In addition to the metallographic microstructural analysis, the characterization of the repair weld was carried out by means of hardness distribution measurements, static tensile testing and notched bar impact testing as well as fracture mechanics investigations under static and under cyclic loading in a wide load ratio range. On this basis, a generalized description of cyclic crack growth could be made according to the NASGRO® MODEL. NASGRO® is a fracture mechanics and fatigue crack growth software. In accordance with the possible operating conditions of repair-welded, thick-walled components, the static and impact tests were performed in the temperature range down to \(-\)40 \({}^{\circ }\text {C}\).

Abstract Image

对厚壁球墨铸铁部件修复焊接的断裂力学特征描述的贡献
对于球墨铸铁材料(也称为球墨铸铁 (DCI))EN-GJS-400-18-LT 和 EN-GJS-450-18,对不同的焊接程序进行了潜在的修补焊接试验。在每种情况下,都使用最佳焊接程序对铸铁厚板进行了修复焊接。对焊缝的所有区域(焊缝金属、熔合线/热影响区和母材)都进行了评估。除金相显微结构分析外,还通过硬度分布测量、静态拉伸测试和缺口棒冲击测试,以及在较大载荷比范围内的静态和循环载荷下的断裂力学研究,对修复焊缝进行了表征。在此基础上,可根据 NASGRO® 模型对循环裂纹生长进行概括性描述。NASGRO® 是一款断裂力学和疲劳裂纹增长软件。根据修复焊接厚壁部件的可能工作条件,静态和冲击试验是在低至\(-\)40 \({}^{\circ }\text {C}\) 的温度范围内进行的。
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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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