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首页> 外文期刊>Science and Technology of Advanced Materials >Control of mechanical properties in structural steel welds by numerical simulation of coupling among temperature, microstructure, and macro-mechanics
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Control of mechanical properties in structural steel welds by numerical simulation of coupling among temperature, microstructure, and macro-mechanics

机译：通过温度，微观结构和宏观力学之间耦合的数值模拟，控制结构钢焊缝的机械性能

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摘要

The mechanical characteristics of steel welded structures such as tensile strength or fracture toughness depend on welding conditions, and multiple welding heat cycles particularly affect the joint performance. It should be controlled under consideration of the microscopic and macroscopic behaviors in materials. In this paper, numerical simulation method of coupling analysis of temperature, microstructure, and stress-strain fields has been developed and applied to investigate the effects of heat input and interpass temperature at multi-pass welded joint of beam-to-column connections on the strength and fracture. Tensile test, Charpy impact test, and three-point bending CTOD test are performed by using welded joint specimen fabricated with various welding conditions. The results of experiments actually show that there exists a welding condition that decreases the joint performance. Three-dimensional thermal elastic-plastic finite-element analysis is developed and performed by using heat source movement and considering phase transformation effect in order to evaluate the proportion of microstructure, distribution of hardness and strength. The parameters of heat input, interpass temperature, and welding direction are changed in the analyses, and the results are used for the consideration of the effect of multiple heat cycles on joint performance. The analytical and the experimental results have shown that controlling heat input and interpass temperature are important features to assure the integrity of welded joints in beam-to-column connections of steel framed structures, and that mechanical properties of the weld metal and the heat-affected zone could be predicted and controlled by using numerical simulation.
机译：钢焊接结构的机械特性（例如拉伸强度或断裂韧性​​）取决于焊接条件，并且多次焊接热循环会特别影响接头性能。应在考虑材料的微观和宏观行为的基础上对其进行控制。本文研究了温度，微观结构和应力-应变场耦合分析的数值模拟方法，并将其应用于研究梁对柱连接的多道次焊接接头处的热量输入和道间温度对结构的影响。强度和断裂。拉伸试验，夏比冲击试验和三点弯曲CTOD试验是使用在各种焊接条件下制作的焊接接头试样进行的。实验结果实际上表明存在焊接条件降低了接头性能。利用热源运动并考虑相变效应，开发并进行了三维热弹塑性有限元分析，以评估微观结构的比例，硬度和强度的分布。分析中改变了热输入，道间温度和焊接方向的参数，并将结果用于考虑多个热循环对接头性能的影响。分析和实验结果表明，控制热量输入和道间温度是确保钢框架结构梁对柱连接中焊接接头完整性的重要特征，并且焊接金属的机械性能和受热影响区域可以通过数值模拟来预测和控制。

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