Chinese Journal of Lasers, Volume. 36, Issue 12, 3210(2009)

Investigation on KIC of As-Deposited Ti-6Al-4V Alloy Fabricated by Laser Solid Forming

Xue Lei1、*, Chen Jing1, Yu Wenjun2, Lin Xin1, and Huang Weidong1
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    Samples of Ti-6Al-4V used in the test of plane strain fracture toughness (KIC) test is fabricated by laser solid forming (LSF). Primary β grain,with a characteristic of epitaxial growth along the depositional direction,shows an average width of 100-400 μm and length of several centimeters. Within β grains,lathy α needles and fine-weaved dense Widmanstatten α+β laths are observed. KIC≥52.6 MPa·m1/2 reaches the forging standard. And as same as the tensile property of LSF Ti-6Al-4V sample,KIC property presents remarkable anisotropism which is caused by the microstructure characteristic. Fine-weaved dense Widmanstatten α+β laths owns strong ability in anti-crack-propagation,in result,crack-propagation shows sentivites to β grain boundary. If crack propagation runs the direction perpendicular to β grain boundary,KIC value reaches maximum;if crack propagation runs the direction along β grain boundary,the longer the boundary,the higher the KIC value. It is more easier for crack propagation with a small angle between crack-propagation direction and β grain boundary(0-90°). The bigger angle and smaller β grain both result in difficulties in crack-propagation.

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    Xue Lei, Chen Jing, Yu Wenjun, Lin Xin, Huang Weidong. Investigation on KIC of As-Deposited Ti-6Al-4V Alloy Fabricated by Laser Solid Forming[J]. Chinese Journal of Lasers, 2009, 36(12): 3210

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    Paper Information

    Category: laser manufacturing

    Received: Oct. 14, 2009

    Accepted: --

    Published Online: Dec. 18, 2009

    The Author Email: Lei Xue (xuenwpu@gmail.com)

    DOI:10.3788/cjl20093612.3210

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