Electrochemical and mechanical behaviors of dissimilar friction stir welding between 5086 and 6061 aluminum alloy

原子模拟引导的卷积神经网络用于摩擦搅拌焊接的热建模

Atomistic Simulation Guided Convolutional Neural Networks for Thermal Modeling of Friction Stir Welding

本研究利用原子模拟数据训练卷积神经网络，准确预测摩擦搅拌焊接的温度分布，实现了与原子尺度物理机制的一致性。

Precipitate stability and recrystallisation in the weld nuggets of friction stir welded Al-Mg-Si and Al-Mg-Sc alloys

Two different precipitate hardening aluminium alloys processed by friction stir welding were investigated. The microstructure and the hardness of the as delivered materials were compared to that of the weld nugget. Transmission electron microscopy observations combined with three-dimensional atom probe analyses clearly show that β;" precipitates dissolved in the nugget of the Al-Mg-Si giving rise to some supersaturated solid solution. It is shown that the dramatic softening of the weld could be partly recovered by post-welding ageing treatments. In the Al-Mg-Sc alloy, Al3Sc precipitate size an…

MaterialsMap：一种基于CALPHAD的工具，通过可行性图设计所需异种材料的成分路径，并以Ag-Al-Cu的电阻点焊连接为例进行演示

MaterialsMap: A CALPHAD-Based Tool to Design Composition Pathways through feasibility map for Desired Dissimilar Materials, demonstrated with RSW Joining of Ag-Al-Cu

本文介绍基于CALPHAD的开源软件MaterialsMap，通过结合平衡热力学与Scheil-Gulliver模拟设计异种材料液相组装的成分路径，并以Ag-Al-Cu电阻点焊实验验证其有效性。

A new physical simulation tool to predict the interface of dissimilar aluminum to steel welds performed by Friction Melt Bonding

Optimization of the intermetallic layer thickness and the suppression of interfacial defects are key elements to improve the load bearing capacity of dissimilar joints. However, till date we do not have a systematic tool to investigate the dissimilar joints and the intermetallic properties produced by a welding condition. Friction Melt Bonding (FMB) is a recently developed technique for joining dissimilar metals that also does not exempt to these challenges. The FMB of DP980 and Al6061-T6 is investigated using a new physical simulation tool, based on Gleeble thermo-mechanical simulator, to und…

Microstructural evolution of a low-alloy steel / nickel superalloy dissimilar metal weld during post-weld heat treatment

The microstructural evolution of a dissimilar metal weld (DMW) obtained by narrow-gap gas tungsten arc welding (NG-GTAW) was investigated after it was subjected to a post-weld heat treatment (PWHT). The case studied here is a joint between low-alloy steel pipes and a stainless steel steam generator using a nickel based alloy as filler material. The fusion boundary that was the focus of this work was that between the low-alloy steel (2.25Cr-1Mo) and the nickel alloy (alloy 82). The difference in matrix phase and chemical composition between the two alloys leads to a large difference in chemical…

Combined numerical and experimental estimation of the fracture toughness and failure analysis of single lap shear test for dissimilar welds

The single lap shear test is widely used to measure the strength of dissimilar welds even though such a test brings limited understanding of the intrinsic weld toughness. The present study proposes a numerical finite element (FE) analysis and experimental characterization of dissimilar joints presenting various microstructures (thickness of the intermetallic layer (IML) and hardness profile). For this purpose, Friction Melt Bonding (FMB) and Friction Stir Welding (FSW) were used to join aluminum AA6061 and Dual Phase steel (DP980). The FE simulations allowed calculating the evolution of the J-…