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Welding Metallurgy of
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The article was published on 1987-01-01 and is currently open access. It has received 991 citations till now. The article focuses on the topics: Welding.read more
Citations
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A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties
TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.
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Dislocation network in additive manufactured steel breaks strength–ductility trade-off
Leifeng Liu,Qingqing Ding,Yuan Zhong,Ji Zou,Jing Wu,Yu-Lung Chiu,Jixue Li,Ze Zhang,Qian Yu,Zhijian Shen +9 more
TL;DR: In this article, the authors show that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion.
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Critical review of automotive steels spot welding: process, structure and properties
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
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Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
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Using deep neural network with small dataset to predict material defects
TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.
References
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Development of a gleeble based test for post weld heat treatment cracking in nickel alloys
Abstract: The purpose of this work was to use a thermo-mechanical simulator to develop a simple test that will quantify susceptibility to the various forms of postweld heat treatment cracking, including stress-relief cracking and strain-age cracking. Materials evaluated include Waspaloy and Alloy 718. Samples are initially given an elevated temperature thermal exposure that simulates the weld HAZ. Upon cooling from elevated temperature, the sample is loaded such that yield strength magnitude stresses are present at room temperature. The sample is then heated to a selected PWHT temperature and held for up to 8 hours. Acquisition of tensile force data during PWHT shows an initial relaxation of stresses, followed by a rise in stress as precipitation reactions proceed. Hot ductility tests were performed at various PWHT temperatures and times. From the reduction in area measurements a mathematical model was developed to relate ductility to PWHT temperature and time. The alloys tested show a significant dip in ductility at elevated temperature. Waspaloy samples exhibited lower ductility at elevated temperatures than did Alloy 718. SEM fractography and optical microscopy were used to analyze the failed samples. Minimum ductility samples revealed ductile intergranular fracture paths in Waspaloy and a tendency for transgranular cracking in Alloy 718. Intergranular microii cracks were evident in a coarse grained heat affected zone in both alloys. Grain size was shown to effect ductility and fracture mode. Smaller grained simulated HAZ samples exhibited more ductility and exhibited more transgranular ductile fracture. Larger grains caused an increase in intergranular fracture and a reduction in elevated temperature ductility. Alloy 718 showed evidence of bending of crystal lattices to accommodate stresses. Both alloys showed indications of an effect of crystal orientation on cracking susceptibility.
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Influence of alloy type, peak temperature and constraint on residual stress evolution in Satoh test
TL;DR: In this paper, the authors compared the evolution of residual stress measured in the Satoh test for ferritic and stainless steels for weld thermal cycles with a peak temperature above Ac3 and showed that the residual stress levels among these alloys are similar for peak temperatures below Ac3.
Structural reduced scale models based on similitude theory
TL;DR: Taking into account that material constitutive similarity is one of the requisites to achieve similitude of structural behavior, the focus of this research is in establishing similarity conditions regarding relevant welding parameters, such that the constitutiveSimilitude is improved as much as possible, even if the thermal similitudes has to be distorted.
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Fe–Si–Al Coatings with Stable Wear Resistance Prepared by Laser Cladding Industrial Wastes
TL;DR: In this article, the microstructure, as well as the wear mechanism of the Fe-Si-Al coatings, was investigated, and it was shown that wear is mainly dominated by abrasive wear and adhesive wear.