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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Dissimilar friction-stir welding of 430 stainless steel and 6061 aluminum alloy: Microstructure and mechanical properties of the joints
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Dissimilar friction-stir welding of 430 stainless steel and 6061 aluminum alloy: Microstructure and mechanical properties of the joints

机译：不同的摩擦搅拌焊接430不锈钢和6061铝合金：关节的微观结构和力学性能

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摘要

The effect of friction-stir welding parameters on the microstructure and the mechanical properties of the dissimilar 430 stainless steel and 6061 aluminum alloy joints were investigated. Optical and scanning electron microscopes in conjunction with energy dispersive X-ray analysis were employed to study the microstructure of the joints. Tensile and microhardness tests were used to evaluate the mechanical properties. The results showed that the best appearance quality was achieved at a rotational speed of 900 r/min, a traverse speed of 120 mm/min, and a tool offset of zero. The tool offset was the most effective parameter affecting the weld quality. The stir zone of the joints had a composite structure in which the dispatched steel particles were distributed in aluminum. The best interface quality belonged to the joints welded at an offset of zero, which had a serrated nature with mechanical locking of the dissimilar parts. However, at negative and positive values of offsets, formation of voids and microcracks reduced the tensile properties of the joints. The tensile fracture of the joints occurred in the heat affected zone of the aluminum part, which had the lowest hardness amount between the microstructural zones. The fracture surfaces of the tensile specimens showed bimodal behavior.
机译：研究了摩擦搅拌焊接参数对微观结构的影响和不同的430不锈钢和6061铝合金接头的机械性能。使用与能量分散X射线分析结合光学和扫描电子显微镜来研究关节的微观结构。使用拉伸和微硬度测试来评估机械性能。结果表明，最佳的外观质量以900 r / min的转速，横向速度为120 mm / min，零件偏移为零。刀具偏移是影响焊接质量的最有效参数。接头的搅拌区具有复合结构，其中调度的钢颗粒在铝中分布。最佳界面质量属于滤零焊接的接头，其具有具有不同零件的机械锁定的锯齿性。然而，在偏移的阴性和正值下，空隙和微裂纹的形成降低了关节的拉伸性质。关节的拉伸断裂发生在铝部分的热影响区域中，其在微观结构区之间具有最低的硬度量。拉伸试样的断裂表面显示双峰行为。

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