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Development of 3-Dimensional (3D) response surfaces to maximize yield strength and elongation of InterPulsed TIG welded thin high temperature alloy sheets for jet engine applications
CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2020-10-14 , DOI: 10.1016/j.cirpj.2020.09.003
Tushar Sonar , Visvalingam Balasubramanian , Sudersanan Malarvizhi , Thiruvenkatam Venkateswaran , Dhenuvakonda Sivakumar

Alloy 718 is a high temperature nickel base superalloy, broadly used in the aerospace sector due to its exceptional strength at elevated temperature. It is more vulnerable to the segregation of alloying elements and development of laves phase in fusion zone (FZ) owing to the high heat input in Tungsten Inert Gas (TIG) welding which drastically deteriorates the yield strength and ductility of welded joints. To obviate this problem, a newly emerged InterPulsed TIG welding process, principally characterized by electromagnetic constriction and high frequency pulsation of arc, was employed to make the joints of thin Alloy 718 sheets. The three-dimensional (3D) response surface graphs were developed using Response Surface Methodology (RSM) to identify the InterPulsed TIG welding parameters giving maximum yield strength and elongation. The yield strength and elongation of joints were predicted from the parametric mathematical models. The mathematical relationships were also developed to predict yield strength and elongation from volume fraction (%) of laves phase. The InterPulsed TIG welded joints exhibited a maximum of 94.45% and 82.89% of base metal yield strength and elongation. It is attributed to the grain refinement in FZ and substantial evolvement of laves phase in finer discrete morphology.



中文翻译:

开发3维(3D)响应表面,以最大程度地提高喷气发动机应用的InterPuls TIG焊接薄高温合金薄板的屈服强度和伸长率

718合金是一种高温镍基高温合金,由于其在高温下的出色强度而广泛用于航空航天领域。由于钨极惰性气体保护(TIG)焊接中的高热量输入,它更容易受到合金元素的偏析和熔合区(FZ)中Laves相的发展的影响,这极大地降低了焊接接头的屈服强度和延展性。为了解决这个问题,采用了一种新出现的InterPulsed TIG焊接工艺,其主要特征是电磁收缩和电弧的高频脉动,以制造718合金薄板的接头。使用响应表面方法(RSM)开发了三维(3D)响应表面图,以识别InterPulsed TIG焊接参数,从而获得最大的屈服强度和伸长率。从参数数学​​模型预测接头的屈服强度和伸长率。还建立了数学关系式,以根据熔渣相的体积分数(%)预测屈服强度和伸长率。InterPulsed TIG焊接接头的母材屈服强度和延伸率最大为94.45%和82.89%。这归因于FZ中的晶粒细化和Laves相在较细的离散形态中的大量演化。

更新日期:2020-10-15
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