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土钉墙支护设计在市政工程的山体边坡稳定及建筑工程的地下室基坑支护中得到广泛应用,适用于粉质、砂质粘土等地质情况。本文介绍了某市政道路的山体边坡稳固支护采用土钉墙施工的过程及取得的良好效果。 相似文献
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Microstructure and mechanical properties of dissimilar joint between aluminum and aluminum-coated steel by cold metal transfer process 下载免费PDF全文
Two dissimilar materials, aluminum alloy and aluminum-coated steel, were joined by cold metal transfer process using AlSi5 filler wire. To this end, the steel was coated with Al-Si. The steel did not melt and aluminum was melt to form the joint during the process, it was actually cold metal transfer welding-brazing. The macrostructure, microstructure, alloy element distribution, and inter-metallic compounds were analyzed by optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy. It was found that the Al-Si coating dissolved into the weld metal. The pre-existing thin Fe-Al-Si ternary inter-metallic compounds in the interface between the Al-Si coating layer and base metal steel also partially dissolved into the weld zone, tending to reduce the thickness of inter-metallic compounds. Approximate 3 μm thick undissolved inter-metallic compound was found at the interface after welding which could guarantee sound bonding strength in dissimilar materials joining. The sample was fractured at the fusion zone near the aluminum side in the tensile test. The ultimate tensile strength was about 156 MPa, and the fracture mode is ductile failure in nature according to its morphology. 相似文献
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Microstructures and wear resistance of high boron and low carbon ferroalloy using hybrid powder/ wire overlaying method 下载免费PDF全文
The high boron alloy surfacing layer was easily cracked due to its insufficient toughness by using hybrid powder/wire overlaying method. In order to explore the cracked mechanism, the microstructures and the wear resistance of the samples with different boron contents were studied. Further, phases analysis, microhardness, macrohardness and wear test were also carried out. The boron content depended microstructures were observed. The precipitation of the Fe 2 B, Fe 3 ( C, B) , Fe 23 ( C, B) 6 were increased with the increase of boron content. It was found that the wear resistance was independent of the macrohardness as the macrohardness increased firstly and then remained steady at ~ 62 HRC. However, the wear resistance was depended on the boron contents, and which increased with the increase of the boron contents. The abrasive loss mechanism changed from plastic deformation removal to fracture removal. 相似文献
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