Influence of processing parameters on beta grain morphology of laser solid forming of Ti-25V-15Cr burn-resistant titanium alloy
Influence of processing parameters on beta grain morphology of laser solid forming of Ti-25V-15Cr burn-resistant titanium alloy
复制标题
加工参数对Ti-25V-15Cr难燃钛合金激光立体成形β晶粒形貌的影响
DOI：
10.1007/s00170-016-9803-x
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发表时间：
2017-07
影响因子：
3.4
通讯作者：
Zhang Zhehui
中科院分区：
文献类型：
--
作者：
Zhang Fengying;Liu Tong;Zhao Hanyu;Tan Hua;Hu Guang;Zhang Zhehui
采用激光固相成形（LSF）技术，将Ti、V、Cr混合粉末制备成一种耐烧钛合金Ti- 25v - 15cr，得到的样品中V、Cr元素分布均匀。结果表明，激光固相成形的Ti- 25v - 15cr合金的晶粒形貌与激光固相成形制备的常规钛合金的大柱状晶粒有很大的不同。当激光功率从1500 W增加到2400 W时，激光固相成形Ti-25V-15Cr合金表现出与先前-β晶粒相似的形貌特征，主要由长径比略高于1的近等轴晶粒或竹状小柱状晶粒组成。同时，随着激光功率的增加，气体孔隙度显著降低。在一定的加工参数下，将扫描速度从10 mm s−1降低到2.5 mm s−1，激光固相成形Ti-25V-15Cr合金的前期-β晶粒形貌由小的近等轴晶粒转变为外延生长的大柱状晶粒。晶粒尺寸增大，孔隙率显著降低。最后，结合柱向等轴转变（CET）模型和沉积过程热行为分析，阐明了不同工艺参数下-β晶粒的形成机理。
A burn-resistant titanium alloy Ti-25V-15Cr was deposited by laser solid forming (LSF) from blended Ti, V, and Cr powders, resulting in as-deposited samples with uniformly distributed elements of V and Cr. It was found that the grain morphology of LSF Ti-25V-15Cr alloy differed quite significantly from conventional titanium alloy components obtained by LSF, which are usually characterized by large columnar grains. With increasing laser power from 1500 to 2400 W, laser solid formed Ti-25V-15Cr alloy exhibited similar morphological characteristics of prior-β grains, which are mainly composed of near-equiaxed grains with an aspect ratio that is a little higher than 1, or small bamboo-like columnar grains. Meanwhile, gas porosity was significantly reduced with increasing laser power. By decreasing the scanning speed from 10 to 2.5 mm s−1under certain processing parameters, the morphology of the prior-β grains of laser solid formed Ti-25V-15Cr alloy turned from small near-equiaxed grains to large columnar grains that grow epitaxially. The grain size increased while the gas porosity significantly decreased. Finally, the formation mechanism of prior-β grains under different processing parameters was elucidated by combining the columnar to equiaxed transition (CET) model and the thermal behavior analysis during deposition.
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DOI：
10.1007/s00170-015-7481-8
发表时间：
2016-11
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
作者：
H. Tan;Fengying Zhang;Xingling Fu;Jian-ping Meng;Guang Hu;W. Fan;Weidong Huang
通讯作者：
H. Tan;Fengying Zhang;Xingling Fu;Jian-ping Meng;Guang Hu;W. Fan;Weidong Huang
影响因子：
6.6
作者：
N. Pimenova;T. Starr
通讯作者：
N. Pimenova;T. Starr
影响因子：
1.8
作者：
FLOOD, SC;HUNT, JD
通讯作者：
HUNT, JD
DOI：
10.1016/j.jmatprotec.2007.06.090
发表时间：
2008-03-03
影响因子：
6.3
作者：
Tan Hua;Chen Jing;Huang Weidong
通讯作者：
Huang Weidong
影响因子：
6.7
作者：
Fude Wang;Junfa Mei;Xinhua Wu
通讯作者：
Fude Wang;Junfa Mei;Xinhua Wu