Fatigue behavior of welded joints of a Ni–Fe-based superalloy

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Xin Huang, Hongyu Qi, Shaolin Li, Xiaoguang Yang, Duoqi Shi
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Abstract

This study investigated the fatigue behavior of butt weld joints in a Ni–Fe-based superalloy GH1140 at 650 °C. The welded joints were prepared by the gas tungsten arc welding process on GH1140 plates with a thickness of 20 mm and a 45° K-shape groove. Vickers hardness tests on the cross-section of the welded joints showed slightly lower hardness in the weld center compared to the base metal. Fatigue test results demonstrated a reduction in fatigue lifetime for the welded joints compared to the base metal, attributable to the combined effects of reduced hardness in the weld metal and material heterogeneity. The reduction in lifetime was found to be stress-dependent, with a transition from fatigue fracture at lower stress levels to shear fracture at higher stress levels. Moreover, an empirical fatigue lifetime prediction model was used to predict the fatigue lifetime of the welded joints, showing good agreement with experimental data.

Abstract Image

ni - fe基高温合金焊接接头的疲劳行为
研究了ni - fe基高温合金GH1140对接焊缝在650℃下的疲劳行为。在厚度为20 mm、45°k形坡口的GH1140板上采用钨极气体保护焊工艺制备焊接接头。焊接接头截面的维氏硬度测试显示,焊缝中心的硬度略低于母材。疲劳测试结果表明,与母材相比,焊接接头的疲劳寿命缩短,这是由于焊接金属硬度降低和材料不均匀性的综合影响。寿命的缩短与应力有关,从较低应力水平下的疲劳断裂过渡到较高应力水平下的剪切断裂。利用经验疲劳寿命预测模型对焊接接头的疲劳寿命进行了预测,结果与实验数据吻合较好。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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