Advertisement

Microstructure and Properties of Large Diameter Elbow of Ti75 Titanium Alloy with Short Radius Made by Expanded-Diameter and Pushed-Bend Method

  • Jun Chen
  • Tingxun Wang
  • Yu Du
  • Haiying Yang
  • Wei Zhou
  • Shewei Xin
  • Qian Li
Conference paper

Abstract

The elbow made by expanded-diameter and pushed-bend method is feasible. Under the action of pushing force, expanding-diameter and bending moment of horn mould, the elbow generates composite deformation including bending and compressing deformation along axial direction and off-center expanding-diameter deformation along circumferential direction. The expanding-diameter deformation reduces wall thickness, while the compressing deformation of belly is greater than that of back, and result in thickening wall thickness on belly and eccentricity. The wall thickness flowed from belly to back along two sides of horn mould during expanding-diameter to compensate for thinned wall thickness on back of elbow during off-center expanding-diameter. The wall thickness uniformity of elbow was related to design of horn mould, pushing temperature and temperature field and pushing rate. The temperature of Ti75 titanium alloy elbow made by expanded-diameter and pushed-bend method was chosen in two phase region. It can reduce the deformation resistance and improve the alloy plasticity, and the elbow keeps the properties and microstructure consistent with pipe. The elbow made in β phase region easily produce grain over burning and overgrowing. The annealing of Ti75 titanium alloy elbow can be selected in two phases, which can keep elbow strength and microstructure homogenization.

Keywords

Expanded-diameter and pushed-bend method Short radius elbow Ti75 titanium alloy Horn mould 

References

  1. 1.
    K. Li, New process and experimental investigation of pushing-bending elbow by medium-frequency induction heating, Construc. Technol. (Ji Lin). (1994) 32–38.Google Scholar
  2. 2.
    J. Chen, H.Y. Yang and W. S. Duan, The forming technology of metal elbow, Rare Metal Materials and Engin. 37 (2008) 555–560.Google Scholar
  3. 3.
    T. X. Wang, J. Chen, H.Y. Yang and W. S. Duan, The forming technology of titanium alloy elbow, Oil Tuber Goods Engin. 17 (2011) 1–6.Google Scholar
  4. 4.
    J. Chen, W. S. Duan, and H.Y. Yang. The forming technology and using of titanium alloy elbow made by diameter-expanding and pushing,Advanced Materials Research, 2012 International Conference on Advances in Mater. Science and Manuf. Technol. (2012) 992–996.Google Scholar
  5. 5.
    J. Chen, Y. L. Yang, H.Y. Yang, T. X. Wang, The forming parameter design and thickness uniformity control of short radius elbow made by expanding diameter and pushing bend,Mater. Science Forum. 788 (2014) 150–157.Google Scholar
  6. 6.
    J. Chen, Y. L. Yang, H.Y. Yang, T. X. Wang, W. S. Duan, Metal rheological characteristics of elbow made by expanding diameter and pushing bend, The Chin. Journal of Nonfer. Metals. 23 (2013) 226–230.Google Scholar
  7. 7.
    X. Y. Lu, B. Y. Xu, Z. Z. Cen, B. J. Shi. The characteristics of force and deformation in forming process of heated pushing curved tubes through OX-core, Mechan. and Engin. 20 (1998) 15–17.Google Scholar
  8. 8.
    B. Y. Xu, K. Li, The primary research of forming processing and forming mechanics of elbow pipe made by medium frequency heating, Forging and Stamping Technol. 25 (1994) 11–14.Google Scholar
  9. 9.
    L. T. Li, W. D. Zeng, J. O. Yin, X. M. Zhang et al, Finite element simulation of pipe bending process of pure titanium using local induction heating, Forging & Stamping Tech. 31 (2006) 131–134.Google Scholar
  10. 10.
    X. Y. Lu, B. J. Shi, X. L. Lu, Experimental analytics for axis-thrust tube bending, Metal form. Mach. (1997) 10–13.Google Scholar
  11. 11.
    J. Chen, H. Y. Yang, W. S. Duan, The important technology parameters of elbow made by diameter-expanding and pushing, The Chin. Journal of Nonfer. Metals. 20 (2012) 704–706.Google Scholar
  12. 12.
    W. S. Duan, Improvement of elbow forming technology of titanium and its alloys, Acta Metall. Sinic. 38 (2002) 422–424.Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Jun Chen
    • 1
  • Tingxun Wang
    • 1
  • Yu Du
    • 1
  • Haiying Yang
    • 1
  • Wei Zhou
    • 1
  • Shewei Xin
    • 1
  • Qian Li
    • 1
  1. 1.Northwest Institute for Nonferrous Metal ResearchXianChina

Personalised recommendations