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首页> 外文期刊>Journal of Materials Engineering and Performance >Tensile Behavior of Electron Beam-Welded and Post-Weld Vacuum-Annealed Nb-10% Hf-1% Ti Refractory Alloy Weldments
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Tensile Behavior of Electron Beam-Welded and Post-Weld Vacuum-Annealed Nb-10% Hf-1% Ti Refractory Alloy Weldments

机译：电子束焊的拉伸行为和焊接后真空退火的Nb-10％HF-1％Ti耐火合金焊接

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摘要

Nb-10% Hf-1% Ti refractory alloy is a high performance material extensively used for high temperature applications. Electron beam welding is one of the most widely used techniques to join refractory and reactive alloys. Bigger sizes of nozzles for rocket propulsion applications can be either made through deep drawing and flow turning route or by roll bending and welding route both using sheets/plates as input material for fabrication. The latter is a more economical option for mass production of the hardware using such exotic and expensive alloys. In view of this, both as-welded (AW) coupon and weld plus post-weld vacuum-annealed (AW + VA) coupon have been prepared to study their mechanical behavior. It has been observed that tensile strength and ductility have not been reduced in both these conditions vis-A -vis the base metal, confirming weld efficiency of the alloy to be similar to 100%. Microhardness is found to be 150-160 VHN in the base metal and 200-225 VHN in the weld fusion zone in AW condition, which became uniform (145-155 VHN) throughout the weldment in AW + VA condition. Microstructure of the weldment in AW condition is found to be consisting of grains solidified by epitaxial mode from base metal toward the weld centre. In AW + VA condition, improvement in tensile elongation is observed, which is found to be due to the presence of homogenized grains/more uniform microstructure near the heat-affected zone as compared to the steep gradient in grain size in different zones in the weld in AW condition.
机译：Nb-10％HF-1％Ti耐火合金是广泛用于高温应用的高性能材料。电子束焊接是加入耐火材料和反应合金的最广泛使用的技术之一。对于火箭推进应用的较大尺寸的喷嘴可以通过深拉伸和流量转动路线或通过使用纸张/板作为用于制造的输入材料来制造。后者是使用这种异国情调和昂贵的合金的批量生产的更经济选择。鉴于此，已准备好焊接（AW）优惠券和焊接焊接真空退火（AW + VA）优惠券，以研究其机械行为。已经观察到，在这些条件Vis-a -vis中，抗拉强度和延展性在基础金属中没有减少，确认合金的焊接效率与100％相似。在AW + VA条件下，焊接融合区中的焊接融合区中的焊接融合区中的基础金属和200-225 VHN中的300-225 VH在焊接融合区中被发现为150-160 VHN。发现AW条件的焊接微观结构由通过从基础金属朝向焊接中心的外延模式固化的晶粒组成。在AW + VA条件下，观察到拉伸伸长率的改善，该改善是由于焊接中不同区域中的颗粒尺寸的陡峭梯度附近的均质化晶粒/更均匀的微观结构。在一个条件下。

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