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您的检索式：作者名="R.R.Ambriz"
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| 1 | Inconel 718合金钨极惰性气体保护焊的热循环(英文)显示文摘采用热动源模型和瞬态热分析相结合,并借助于有限元方法,确定在Inconel 718合金板上应用钨极惰性气体保护焊获得的焊接热循环和等温截面。Rosenthal厚板模型和有限元分析结果显示,焊接热循环与实验值较相近。与实验曲线相比,用双椭圆模型热分布数值模拟确定的等温截面其拟合效果优于高斯模型。为了分析不同冷却速率下熔融区和热影响区显微组织的转变,进行维氏显微硬度测量(由横截面硬度分布曲线和纵截面硬度分布映射图表示)。与基体材料的显微硬度(~350 HV_(0.2))相比,热影响区(~200 HV_(0.2))和熔融区(~240 HV_(0.2))的显微硬度降低,这是由于根据连续冷却转变曲线,γ″相(镍基体)的不均匀溶解过程生成Laves相、δ相和金属间化合物过渡相,使熔融区的硬度值降低。 | M.HERNáNDEZ R.R.AMBRIZ R.CORTéS C.M.GóMORA G.PLASCENCIA D.JARAMILLO | 2019 | Transactions of Nonferrous Metals Society of China2019，29，3： | 6 |
| 2 | Tensile Properties and Fusion Zone Hardening for GMAW and MIEA Welds of a 7075-T651 Aluminum Alloy显示文摘Tensile and hardness values for 7075-T651 aluminum alloy in the as welded and post weld heat treated conditions(solubilization and artificial aging-T6),obtained using GMAW and modified indirect electric arc(MIEA)welding processes are presented.Results showed that the base material along rolling direction exhibited a tensile strength of around 600 MPa and elongation of 11%.For the as welded condition,tensile strength was 260 MPa and elongation percent of 3%.This behavior was attributed to brittleness induced by the microstructural characteristics of the welded alloys,as well as high porosity.Hardness profiles along the welds were obtained and different welded zones were identified.A soft zone(*100 HV0.1) in the heat affected zone for GMAW and MIEA was observed,the minimum hardness corresponding to weld metal(*85 and *96 HV0.1for GMAW and MIEA,respectively).The high dilution between filler and base metal during welding in MIEA allows to the Zn and Cu to flow from the base metal into the weld metal,inducing hardening by solution and subsequent artificial aging.In this regard,the hardness of the weld metal for MIEA increases by 56%,while the tensile strength reaches a value close to 400 MPa.For GMAW,non-favorable hardening effect was observed for the weld metal after solution and artificial aging. | N.Alatorre R.R.Ambriz B.Noureddine A.Amrouche A.Talha D.Jaramillo | 2014 | Acta Metallurgica Sinica(English Letters)2014，27，4： | 4 |
| 3 | 采用改进冲击摆锤评价7075-T651合金焊缝的断裂能(英文)显示文摘采用改进冲击摆锤,研究7075-T651合金焊缝夏比试样的力-时间曲线。考虑力-时间曲线和恒冲击速率,获得不同区域的断裂能。与焊缝金属(7.88 J)和基体金属(5.37 J(纵向)和7.37 J(横向))的断裂能相比,热影响区的断裂能更高(33.6 J),这是由于焊接过程中,热力学不稳定的η′相发生组织转变。焊缝区的断裂能比基体合金的高,这是由于焊接凝固过程中产生大量孔洞。为从力-时间曲线中获得动态屈服力,对焊缝、热影响区和基体合金的屈服强度进行近似处理。断裂形貌表明,基体合金在纵向方向上呈现晶间断裂,而在横向方向上,主要为脆性(解理)断裂并伴有韧性断裂特征。而焊缝区和热影响区则呈现韧性断裂。 | R.R.AMBRIZ D.JARAMILLO C.GARCIA F.F.CURIEL | 2016 | Transactions of Nonferrous Metals Society of China2016，26，4： | 0 |
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