共查询到17条相似文献,搜索用时 140 毫秒
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鉴于当前高性能镁合金的应用需求,亟待提高镁合金的表面硬度、摩擦磨损性以及耐蚀性等表面性能。新型固态加工技术——搅拌摩擦加工以及摩擦堆焊能够实现材料的大塑性变形,在镁合金表面微观组织结构改性、表面复合材料化以及金属焊敷层制备等方面得到了成功的应用。在介绍搅拌摩擦加工以及摩擦堆焊技术特性的基础上,分别从工艺手段、组织演变以及性能改善等方面综述了摩擦加工技术用于镁合金表面改性的研究现状。国内外研究结果显示,搅拌摩擦加工可有效细化镁合金表面晶粒,破碎粗大第二相,导入增强粒子,实现表面复合化,进而显著提高镁合金的硬度、耐磨性以及耐蚀性。摩擦堆焊技术可在镁合金表面成功制备无稀释、结合完整性高、均匀细化的金属焊敷层,有效改善镁合金表面硬度及耐磨性。通过对用于镁合金表面改性的摩擦加工技术研究现状的总结,展望了镁合金搅拌摩擦加工以及摩擦堆焊的发展前景,提出了需要进一步研究的方向。 相似文献
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为拓宽摩擦堆焊的工程化应用,以X65钢作为耗材和基板材料进行了摩擦堆焊工艺试验研究,在选定最优焊速的基础上,主要讨论了轴向压力与堆焊层组织、显微硬度及磨损性能的影响。试验表明:在转速4 000 r/min、堆焊速度200 mm/min、轴向压力在59.7~104.4 MPa范围下可获得冶金连接与成型良好的摩擦堆焊层。随轴向压力增加,堆焊层宽度增加、但厚度减小;过高轴向压力不能增加摩擦堆焊层的有效体积。摩擦堆焊接头主要由堆焊层、热影响区(HAZ)和母材区域组成,与传统摩擦焊缝细小晶粒组织特征不同,摩擦堆焊层主要为粗大板条和粒状贝氏体混合组织特征。HAZ主要由过热区和相变重结晶区组成,过热区主要为贝氏体组织特征,而重结晶区为细小铁素体晶粒组织特征。轴向压力变化对堆焊层组织粗化倾向和HAZ尺寸有较大影响,但对HAZ的组织形态影响不大。不同轴向压力下的堆焊层平均硬度及抗磨损性能均高于母材,与母材比较堆焊层磨损体积最大可降低33.3%。 相似文献
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Xuemei Liu Junshan Yao Xinhong Wang Zengda Zou Shiyao Qu 《Journal of Materials Processing Technology》2009,209(3):1392-1399
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. The temperature field of consumable-rod in friction surfacing, as a kind of thermal processing technology, is an important factor in the successful implementation of the process. In this paper, the heat source model of consumable-rod in friction surfacing is established, by which the temperature field of consumable-rod during the process is simulated through finite difference method. The results are consistent with experiments, reappearing the temperature field of consumable-rod during friction surfacing, thus providing theoretical guidance in the choice for key technical parameters in engineering practice. 相似文献
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A coating rod of 1Cr18Ni9Ti (321) was deposited on the substrate of mild steel 1020 to be able to perform a friction surfacing experiment. The temperature changes of special points on the coating rod were measured using a thermocouple. The results show that the temperature increase rate at the friction interface reached a high level at first. Then the rate decreased to a low level once the friction system became quasi-steady and the temperature became approximately stable near the melting point of the coating rod. The theory of contact melting was used to build the physical model for the quasi-liquid layer. Subsequently, the corresponding calculations were carried out. The computer simulation results are found to be consistent with the experiment results, and as such, the present study demonstrates the feasibility of applying contact melting theory to the study of friction surfacing. Likewise, this study reveals that the material at the top of the coating rod is plastic, and that it behaves as a quasi-liquid in the friction surfacing process. The study establishes the theory basis for the study of the mechanism of friction surfacing, and provides a new method for investigating other friction-welding techniques. 相似文献
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电火花沉积/堆焊技术的国内外应用现状 总被引:1,自引:0,他引:1
电火花沉积/堆焊技术是先进的节能、节材、环保的表面工程技术之一.文中综述了其在金属材料的表面改性,工件表面缺陷的修复以及实现基体材料表面的异种材料堆焊三方面的应用事例,旨在更多地介绍这一实用技术的应用现状,并希望引起更多新领域用户的关注. 相似文献
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针对冷冲模具的工作条件,失效形式和性能要求,研制了了CrMoWVTi合金系堆焊金属,并把它分别配制成钨极氩弧焊用药芯焊丝和焊条两种堆焊材料。 相似文献