Peng Zhang, Chen-Hao Zhao, Tian-Feng Wu, Jian-Chao Han
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引用次数: 0
Abstract
Thin-walled 304 stainless steel tubes with annular inner ribs have high strength, high stiffness, and light-weighting characteristics, and have wide applications in the aviation, aerospace, and navigation fields. In this study, stainless steel thin-walled tubes with inner ribs were manufactured by hot power backward-spinning. The microstructural morphology, microhardness, and main texture evolution of typical regions of the tube were characterized and tested. The influence of different stress-loading conditions on the microstructure and mechanical properties of the tube was mainly studied. The numerical simulation for the hot spinning forming process of 304 stainless steel was carried out to analyze the material flow rules in the regions of inner rib and wall-thinning, as well as predict the height of inner ribs with different spinning parameters. The results showed that the thinning of the wall of the tube region is obvious, and the material in the inner rib region fills into the groove of the mandrel, and the loading paths of stress on the materials in these regions are different, and the wall-thinning region is subjected to axial and radial loads accuring plane strain, which leads to the transformation from the original equiaxial crystalline to elongated grains. The microstructure of the sample presented strong < 111>//AD texture for the reason of acutely axial load born from rotating tools during spinning. This study provides a reliable theoretical basis and technical reference for the optimization of the spinning forming process of stainless steel thin-walled tubes with annular inner ribs.
期刊介绍：
The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material.
The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations.
All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.
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