Evaluation of high cycle fatigue behavior of flux cored arc welded naval grade DMR249 A grade steel joints for ship hull structures

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Forces in mechanics Pub Date : 2023-05-01 DOI:10.1016/j.finmec.2023.100189

P. Hariprasath , P. Sivaraj , V. Balasubramanian , Srinivas Pilli , K. Sridhar

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引用次数: 5

Abstract

DMR 249A is a micro-alloyed high strength low alloy (HSLA) steel particularly designed for shipbuilding structures due to its excellent strength-to-weight ratio. In this investigation, the rotating-beam fatigue test was performed on the flux-cored arc welded (FCAW) butt joints of DMR 249A steel. And the fatigue test results compared to mechanical properties and microstructural characteristics. The transverse tensile, microhardness, impact, and fatigue properties were evaluated from across the butt weld. The S-N curve was constructed from the experimental data for the stress ratio R = -1. The evaluated fatigue life of the FCAW joint and parent metal was 366 MPa and 394 MPa, respectively. The maximum achieved transverse tensile strength and impact energy absorption of the FCAW joint was 578 MPa &174 J. The weld region contains an acicular ferrite microstructure, which exhibited improved properties of strength, toughness, and fatigue crack resistance. From the results, the fatigue strength of FCAW is 92.8% that of the parent metal and 62.8% equal to the tensile strength of the FCAW joint.

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药芯弧焊船用DMR249 A级钢船体结构节点高周疲劳性能评价

DMR 249A是一种微合金高强度低合金(HSLA)钢，因其优异的强度重量比而特别设计用于造船结构。本文对DMR 249A钢的药芯弧焊对接接头进行了旋转梁疲劳试验。并将疲劳试验结果与力学性能和显微组织特征进行比较。横向拉伸，显微硬度，冲击和疲劳性能从整个对接焊缝进行了评估。根据应力比R = -1时的实验数据，构建S-N曲线。FCAW接头和母材的疲劳寿命分别为366 MPa和394 MPa。FCAW接头的最大横向抗拉强度和冲击能吸收为578 MPa和174 J.焊缝区为针状铁素体组织，具有较好的强度、韧性和抗疲劳裂纹性能。结果表明，FCAW的疲劳强度为母材的92.8%，相当于FCAW接头抗拉强度的62.8%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Forces in mechanics Mechanics of Materials

CiteScore

3.50

自引率

0.00%

发文量

审稿时长

52 days