基本信息
项目批准号：51775556
申请代码：E0510
项目名称：镁合金的电弧熔敷与搅拌摩擦处理复合成形再制造方法与机理研究
项目负责人：
殷凤良
依托单位：
中国人民解放军陆军装甲兵学院
研究期限：2018-01-01 至 2021-12-31
资助经费：60.0（万元）
项目摘要
中文摘要：
针对废旧镁合金零件的再制造难题，在电弧熔敷增材/铣削减材复合快速成形技术基础上，提出一种电弧熔敷与搅拌摩擦处理复合成形再制造方法。采用冷金属过渡电弧焊熔敷技术实现镁合金的低形变熔敷成形：研究镁合金冷金属过渡电弧焊熔敷过程中熔滴过渡及成形机理，建立熔敷成形过程热应力应变数值分析模型，分析熔敷成形层中粗大组织、气孔、残余应力等缺陷的产生机理及分布形态。运用搅拌摩擦处理技术实现熔敷成形层的性能与尺寸精度一体化处理：研究非平整面薄层状态下搅拌摩擦处理中金属组织的动态再结晶过程，阐明搅拌摩擦处理对电弧熔敷成形层性能与尺寸精度的影响机理，揭示搅拌摩擦引发的材料塑性变形消减熔敷成形过程产生的残余应力的机理；建立搅拌头力学响应数值分析模型，通过对搅拌头受力的调控实现低应力搅拌摩擦处理。本研究可为发展一种新的废旧镁合金零件再制造技术提供相关科学依据。
英文摘要：
Aiming at the problem of remanufacturing of worn-out magnesium alloy parts, a new hybrid forming method of welding arc deposition and friction stir processing is put forward, on the basis of welding arc deposition additive and milling subtractive hybrid rapid forming technology. The cold metal transfer arc welding technology will be applied to realize a low deformation deposition process of magnesium alloy. The droplet transfer and forming mechanism of magnesium alloy would be studied in the cold metal transfer arc welding deposition process. The numerical analysis model of thermal stress and strain in the forming process will be built. The formation mechanism and distribution of defects, such as coarse microstructure, porosity and residual stress, will be analyzed. The friction stir processing will be exerted on the cladding layers to enhance its property and dimensional accuracy in a integrative way. The dynamic recrystallization process will be studied in the friction stir processing of the non smooth thin cladding layers. The influence mechanism of friction stir processing on the performance and dimensional accuracy of arc cladding layer will be clarified. The mechanism of reducing the residual stress produced by the plastic deformation of the material caused by friction stir processing will be revealed. The numerical model of the mechanical response of the stirring head will be established. The low stress friction stir processing will be realized through adjusting of the acting force on the stirring head. This study can provide a scientific basis for the development of a new remanufacturing technology worn-out magnesium alloy parts.
——来自https://kd.nsfc.gov.cn/
