Effect of enhanced weld cooling on the mechanical properties of a structural steel with a yield strength of 700 MPa

Juhani Laitila; Lassi Keraenen; Jari Larkiola

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Effect of enhanced weld cooling on the mechanical properties of a structural steel with a yield strength of 700 MPa

机译：增强焊缝冷却对结构钢的力学性能的影响，屈服强度为700MPa

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摘要

In this study, we present the effect of enhanced cooling on the mechanical properties of a high-strength low-alloy steel (having a yield strength of 700 MPa) following a single-pass weld process. The properties evaluated in this study include uniform elongation, impact toughness, yield, tensile and fatigue strengths alongside the cooling time of the weld. With the steel used in this study, the enhanced cooling resulted in a weld joint characterized with excellent cross-weld uniform elongation, yield and fatigue strength. The intensified cooling reduced the time it takes for the weld to reach 100 °C by around 190 s. Not only the fusion line of the weld was less pronounced, but also the grain size of the CGHAZ was greatly refined as a result of the enhanced cooling. The results indicate that combining external cooling to the welding processes can be beneficial for the studied high-strength steel.

机译：在这项研究中，我们在单遍焊接过程之后呈现了增强的冷却对高强度低合金钢（屈服强度为700MPa）的机械性能的影响。该研究中评估的性质包括均匀的伸长率，冲击韧性，产率，拉伸和疲劳强度以及焊缝的冷却时间。通过本研究中使用的钢，增强的冷却导致焊接接头，其特征具有优异的横焊均匀伸长率，产量和疲劳强度。增强的冷却降低了焊缝达到100°C左右约190秒的时间。不仅焊缝的融合线不太明显，而且由于增强的冷却，CGHAZ的晶粒尺寸大大精制。结果表明，将外部冷却与焊接工艺相结合，对研究的高强度钢具有有益。

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来源
《SN Applied Sciences》 |2020年第11期|1888.1-1888.8|共8页
作者
Juhani Laitila; Lassi Keraenen; Jari Larkiola;
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作者单位

Materials and Production Engineering Faculty of Technology University of Oulu Pentti Kaiteran Katu 1 90570 Oulu Finland;

Materials and Production Engineering Faculty of Technology University of Oulu Pentti Kaiteran Katu 1 90570 Oulu Finland;

Materials and Production Engineering Faculty of Technology University of Oulu Pentti Kaiteran Katu 1 90570 Oulu Finland;

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原文格式 PDF
正文语种 eng
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关键词
Arc welding; Bainite; Cooling time; Fatigue; GMAW; HAZ;

机译：电弧焊接;贝氏体;冷却时间;疲劳;GMAW;哈哈;

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1. Microstructure and mechanical properties of high-strength steel welding consumables with a minimum yield strength of 1100 MPa [J] . Haslberger Phillip, Holly Sylvia, Ernst Wolfgang, Journal of Materials Science . 2018,第9期

机译：高强度钢焊接耗材的微观结构和力学性能，最小屈服强度为1100 MPa
2. MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa [J] . Teemu Lahtinen, Pedro Vila?a, Pasi Peura, Applied Sciences . 2019,第5期

机译：最小屈服强度为700 MPa的现代高强度钢的MAG焊接试验
3. Steels with Yield Strength Higher than 700 MPa for Metallic Structures and the Strength of Their Welded Joints [J] . Odesskii P. D., Gurov S. V Russian Metallurgy(Metally) . 2019,第10期

机译：钢材具有高于700 MPa的金属结构和焊接接头强度的钢
4. Controlled Cooling Process and Mechanical Property of 590MPa Grade Structural Steel with Low Yield Ratio [C] . Jian Kang, Zhaodong Wang, Guo Yuan International Conference on Civil Engineering and Building Materials . 2011

机译：低产率比590MPa级结构钢的控制冷却过程和机械性能
5. Investigating correlations of microstructures, mechanical properties and FSW process variables in friction stir welded high strength low alloy 65 steel. [D] . Wei, Lingyun. 2009

机译：研究摩擦搅拌焊接高强度低合金65钢的微观结构，力学性能和FSW工艺变量之间的相关性。
6. Microstructure Evolution and Mechanical Properties of Underwater Dry and Local Dry Cavity Welded Joints of 690 MPa Grade High Strength Steel [O] . Yonghua Shi, Kun Sun, Shuwan Cui, 2018

机译：690 MPa级高强度钢的水下干局部干腔焊接接头的组织演变和力学性能
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Effect of enhanced weld cooling on the mechanical properties of a structural steel with a yield strength of 700 MPa

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