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激光增材制造过程中循环热输入对组织和性能的影响 被引量:4
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作者 王迪 黄锦辉 +1 位作者 谭超林 杨永强 《金属学报》 SCIE EI CAS CSCD 北大核心 2022年第10期1221-1235,共15页
激光增材制造(LAM)中逐层沉积形成独特的循环热输入,能对沉积材料产生原位热处理(IHT)效应,具有调整微观结构和提高材料力学性能的潜力。本文针对LAM中循环热输入现象进行了详细阐述,分析了工艺参数、沉积方向、层间延时、基板预热、激... 激光增材制造(LAM)中逐层沉积形成独特的循环热输入,能对沉积材料产生原位热处理(IHT)效应,具有调整微观结构和提高材料力学性能的潜力。本文针对LAM中循环热输入现象进行了详细阐述,分析了工艺参数、沉积方向、层间延时、基板预热、激光重熔等对循环热输入的影响行为。不同的循环热输入能对晶粒取向、相组成、第二相析出等微观组织产生明显的影响,进而影响其力学性能。循环热输入产生的IHT效应,为改善材料性能和研发新材料提供了契机。因此本文提出了理解和建立成分-工艺-IHT效应-组织结构-力学性能之间关系的理论,进而为基于IHT效应的LAM专用新材料的研究和发展提供启示。 展开更多
关键词 激光增材制造 循环热输入 原位处理 各向异性 新材料研发
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Crawlspace heating system in detached house with insulated foundation
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作者 刘青荣 阮应君 +1 位作者 RYU Yu-ji 任建兴 《Journal of Central South University》 SCIE EI CAS 2012年第3期623-632,共10页
Two practical crawlspace heating systems introduced in detached houses have been chosen as a field study. One is the crawlspace warm air heating system and the other is the crawlspace hot water circulation system. Bas... Two practical crawlspace heating systems introduced in detached houses have been chosen as a field study. One is the crawlspace warm air heating system and the other is the crawlspace hot water circulation system. Based on the field study result, by using the simulation sol, ware, THERB, the effectiveness of the crawlspace warm air heating system has been examined. The effect of the factors, such as the wind amount circulating between crawlspace and indoor space, foundation insulation condition, and heat amount into the crawlspace, on the indoor thermal environment has been analyzed. Based on these analyses, the measured crawlspace heating system can make the average temperature of the living room above 20℃. These two houses have excellent thermal environment. According to the simulating result, heat amount input into crawlspace, which can make comfortable indoor thermal environment, for every month in heating period has been roughly concluded, and they are 600 W in December and March and 800 W in February and January, respectively. 展开更多
关键词 erawlspaee heating system indoor thermal environment detached house floor insulation foundation insulation
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