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A new electron beam control system was developed in a general vacuum electron beam machine by assembling with industrial control computer, programmable logic control (PLC), deflection coil, data acquisition card, power amplifier, etc. In this control system, scanning track and energy distribution of electron beam could be edited off-line, real-time adjusted and controlled on-line. Ti-Mo gradient material (GM) with high temperature resistant was fabricated using the technology of electron beam melting. The melting processes include three steps, such as preheating, melting, and homogenizing. The results show that the GM prepared by melting technology has fine appearance, and it has good integrated interface with the Ti alloy. Mo and Ti elements are gradually distributed in the inter.face of the gradient material. The microstructure close to the Ti alloy base metal is α + β basket-waver grain, and the microstructure close to the GM is a single phase of β solid solution. 相似文献
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介绍了超低碳贝氏体(ULCB)焊接材料产生的背景、超低碳贝氏体焊缝强韧化机制和冶金理论,还介绍了影响超低碳贝氏体焊缝性能的因素,以及使用该焊接材料时需要解决的问题。文中指出,虽然ULCB焊接材料具有优异的性能,但是焊接方法的选取和保护气氛的选择,对焊缝的性能有很大的影响。焊缝组织和硬度对冷却速率不敏感。最后指出ULCB焊接材料的广泛应用必须解决生产效率问题,通过控制夹杂物大小和消除柱状晶进一步改善焊缝的韧性。 相似文献
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