通过对奥氏体AISI 316L钢GMAW工艺热输入的变化,评价热循环对焊接接头特性的影响

R. Demarque, E.P. dos Santos, R.S. Silva, J.A. de Castro
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引用次数: 10

摘要

焊接工艺通常用于几乎所有工业领域,但由于它必须提供防止可能出现故障的安全性,因此有些应用需要特别注意所获得的产品。在本研究中,采用脉冲链喷转移金属气弧焊(GMAW)对AISI316L钢板进行了热输入变化对焊缝几何形状、热影响区奥氏体晶粒尺寸、热影响区显微硬度和δ铁素体体积分数的影响。用光学显微镜对试样的微观结构进行了表征,在不同的焊接条件下,对这些区域进行了比较研究。从热贡献的变化可以看出,选择理想的热输入对焊接过程中发生的现象有重要的影响。贡献的增加导致奥氏体晶粒尺寸变化近300%,δ铁素体体积分数变化约100%,熔合区面积变化约240%。利用热像仪记录焊接板的温度分布,监测焊接接头各区域的最高温度,并将焊接过程中产生的显微组织与数值模拟得到的热循环结果进行比较。结果显示了良好的一致性,也有助于验证所提出的数值方法,使人们更好地了解焊接过程中的热历史,从而了解它们对AISI 316L钢中微观组织转变的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the effect of the thermal cycle on the characteristics of welded joints through the variation of the heat input of the austhenitic AISI 316L steels by the GMAW process

Welding processes are generally used in almost every industrial segment, but there are some applications that demand special attention to the product obtained, due to the security it must offer against possible failures.

In the present study, the influence of the heat input variation on the weld bead geometry, the austenitic grain size in the HAZ, the microhardness in the HAZ (heat affect zone), and the δ ferrite volumetric fraction using the gas metal arc welding (GMAW) performed with pulsed chain spray transfer, on AISI316L steel plates. The samples had their microstructure characterized by optical microscopy, in their different regions, performing a comparative study of these regions for the different welding conditions. From the variations in the thermal contributions it was demonstrated that the choice of the ideal heat input for a given process has an important effect on the phenomena that occur during welding. The increase of the contribution caused a variation of almost 300% in the austenitic grain size, approximately 100% in the δ ferrite volumetric fraction, and about 240% in the area of the fusion zone (FZ). The temperature distributions of the plates were recorded using a thermal camera in order to monitor the maximum temperatures in each region of the welded joint, the microstructures resulting from the process were later compared with the results of the thermal cycles obtained through numerical simulations. The results showed good agreement and also contributed to the validation of the proposed numerical method, which allowed a better understanding of the thermal history during welding and, consequently, of their effects on the microstructural transformations developed in the AISI 316L steel.

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