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中文摘要：
针对氢化脱氢钛合金粉末氧含量较高的问题，研究了添加稀土钕对激光快速成形TC4合金组织及性能的影响。结果发现，添加稀土Nd后，激光快速成形TC4合金的宏观晶粒尺寸变化不大；但随稀土添加量的增加，初始β列状晶逐渐转化为全β等轴晶，晶粒内部的魏氏α组织逐渐转变为网篮α，粗化α条不断增多，呈现团束聚集趋势，晶界α集束体积分数也不断增大；随稀土添加量的增加，激光快速成形TC4合金的室温塑性先大幅度提高，然后急剧降低；稀土添加量为0．1％～0．2％（质量分数，下同）时，氧含量为0．26％的氢化脱氢TC4合金粉末激光快速成形件沉积态的抗拉强度达975MPa，延伸率9．5％，满足锻件标准要求。
英文摘要：
The effects of rare earth element Nd on the microstructure and mechanical properties were studied for the TC4 titanium alloy by Laser Rapid Forming （LRF）. The results showed that with the increasing of Nd content, the macrostructure of laser formed TC4 changed from prior β columnar crystal to complete β equiaxed crystal, and the primary Widmanstaten α structure was transformed to basket weave α structure. The coarse α laths were gradually increased and tended to gather. At the same time, the volume fraction of α cluster on the grain boundary was increased obviously. With the content of element Nd increasing, the elongation of laser formed TC4 was increased significantly at first, then decreased sharply, while the strength changed a little. The tensile strength was up to 975 MPa and the elongation was enhanced to 9.5% for the laser formed TC4 by HDH with the addition of 0.1%-0.2wt.% Nd and the oxygen content as high as 0.26%, while, achieving the specifications of mechanical properties for forged products.
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Mechanical Properties and Microstructure Characteris-tics of Laser Rapid Forming Rene88DT Superalloy
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