热处理制度对选择性激光熔化成形TC4钛合金的组织与力学性能的影响

发布时间：2018-01-16 04:19

  本文关键词：热处理制度对选择性激光熔化成形TC4钛合金的组织与力学性能的影响　出处：《粉末冶金材料科学与工程》2017年01期 　论文类型：期刊论文

  更多相关文章： 选择性激光成形 TC钛合金 热处理 力学性能

【摘要】：采用金相显微镜、扫描电子显微镜和电子万能材料试验机研究热处理制度对选择性激光熔化成形技术(SLM)成形TC4(Ti6Al4V)钛合金显微组织和力学性能的影响。结果表明:激光成形样品的组织主要由呈外延生长的粗大柱状晶组成,原始柱状β晶粒的显微组织由大量的针状α′相组成;随退火温度升高,条状α相的宽度先增加后降低,强度降低,塑性增加;在(α+β)两相区固溶时,随固溶温度升高,α相的长宽比增加,α相的间距减小,α束集变大,强度升高,塑性降低;对比该7种热处理制度,800℃保温2 h炉冷为最佳热处理工艺,经该工艺处理的试样综合力学性能较好。
[Abstract]:With a metallographic microscope. Scanning Electron Microscopy and Electronic Universal material testing Machine study on the effect of Heat treatment system on selective Laser melting forming (SLM) forming TC4C4Ti6Al4V). The effect of microstructure and mechanical properties on the microstructure of titanium alloy. The results show that the microstructure of laser formed samples is mainly composed of large columnar crystals grown by epitaxial growth. The microstructure of the primitive columnar 尾 grains consists of a large number of needle-like 伪 'phases. With the increase of annealing temperature, the width of stripe 伪 phase first increases and then decreases, the strength decreases and the plasticity increases. In the (伪 尾) two-phase region, with the increase of the solution temperature, the aspect ratio of 伪 phase increases, the spacing of 伪 phase decreases, the set of 伪 beams becomes larger, the strength increases and the plasticity decreases. Comparing these 7 heat treatment systems with 800 鈩，

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