Topic
Heat-affected zone
About: Heat-affected zone is a research topic. Over the lifetime, 18787 publications have been published within this topic receiving 231744 citations.
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25 May 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the NiTi/NiTi joints reached about 75% of the ultimate tensile strength of pure NiTi wires, and no interlayer was used for welding NiTi to steel.
Abstract: The special properties of nickel–titanium shape memory alloys are currently used in micro-engineering and medical technology. In order to integrate NiTi components into existing parts and modules, they often need to be joined to other materials. For this reason, the present contribution deals with the laser welding of thin pseudoelastic NiTi wires (100 μm) with an Nd:YAG laser. Based on extensive parameter studies, faultless joints were produced. This study deals with the structural changes occurring in the fusion and heat-affected zones, the performance of the joints in static tensile tests and their functional fatigue. It can be shown that NiTi/NiTi joints reach about 75% of the ultimate tensile strength of pure NiTi wires. For welding NiTi to steel, no interlayer was used. The dissimilar NiTi/steel joints provide a bonding strength in the fusion and heat-affected zones higher than the plateau stress level. NiTi/steel joints of thin wires, as a new aspect, enable the possibility to benefit from the pseudoelastic properties of the NiTi component.
128 citations
TL;DR: In this paper, a 2219-T6 aluminum alloy was welded at a fixed welding speed and various rotation speeds in order to illuminate the influence of rotation speed on the performance of underwater joints.
128 citations
TL;DR: In this article, a dissimilar friction stir welding between 5052 Al alloy and AZ31 Mg alloy with the plate thickness of 6 mm was investigated, and sound weld was obtained at rotation speed of 600 r/min and welding speed of 40 mm/min.
127 citations
TL;DR: In this article, an overall process model for the microstructural stability of 6082-T6 aluminium alloys at elevated temperatures is presented, composed of elements derived from thermodynamics, kinetic theory and simple dislocation mechanics, and allows predictions of the hardness distribution after reheating and subsequent natural ageing of the base metal for a wide range of operational conditions.
Abstract: The first part of this investigation deals with the development of an overall process model for the microstructural stability of 6082-T6 aluminium alloys at elevated temperatures. The model is composed of elements derived from thermodynamics, kinetic theory and simple dislocation mechanics, and allows predictions of the hardness distribution after reheating and subsequent natural ageing of the base metal for a wide range of operational conditions (including multi-step isothermal heat treatments and continuous thermal cycles). Applications of the model to prediction of strength losses in the heat affected zone (HAZ) of fusion welds are described in an accompanying paper (Part II).
126 citations
TL;DR: In this paper, the evolution of grain structure and topology in three dimensions in both the FZ and the HAZ considering the motion of the liquid pool was investigated. And the results showed that the grain size distributions and topological class distributions were largely unaffected by the temporal and spatial variations of the temperature created by different welding parameters.
126 citations