Investigation of mechanical properties and surface roughness of friction stir welded AA6061-T651

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Mechanical and Materials Engineering Pub Date : 2020-06-06 DOI:10.1186/s40712-020-00119-x

Rajesh Kumar Bhushan, Deepak Sharma

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引用次数: 14

Abstract

Friction stir welding (FSW) of 6-mm-thick plates of AA6061-T651 was carried out using a simple cylindrical pin tool. The impact of welding factors (rotational speed, welding speed) on tensile properties, microhardness, and surface roughness of FSW joints was investigated. Ultimate tensile strength (UTS), yield strength, and % elongation of AA6061-T651 base plate as well as FSW joints were found out using a universal testing machine (UTM). Maximum value of UTS and yield strength were achieved at rotational speed of 1400?rpm and welding speed of 20?mm/min. Minimum surface roughness was reached at rotational speeds of 1400?rpm and welding speed of 20?mm/min. Microstructural evolutions in the friction stir welded (FSWed) joint and microhardness profile were also determined. Maximum hardness of HV 120 was acquired for the stir zone (SZ). Hence, attainment of the maximum tensile strength, microhardness, and minimum surface roughness during FSW is a desired method to improve the service life and suitability of AA6061-T651.

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搅拌摩擦焊AA6061-T651的力学性能和表面粗糙度研究

采用简单的圆柱销工具对6 mm厚的AA6061-T651板进行了搅拌摩擦焊接。研究了焊接转速、焊接速度对FSW接头拉伸性能、显微硬度和表面粗糙度的影响。采用万能试验机(UTM)测定了AA6061-T651基板及FSW接头的极限抗拉强度(UTS)、屈服强度和伸长率。UTS和屈服强度在转速为1400?RPM和焊接速度为20mm /min。当转速为1400?RPM和焊接速度为20mm /min。研究了搅拌摩擦焊接接头的显微组织演变和显微硬度分布。搅拌区(SZ)硬度最高可达hv120。因此，在FSW过程中获得最大的抗拉强度、显微硬度和最小的表面粗糙度是提高AA6061-T651的使用寿命和适用性的理想方法。

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