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Influence of Heat Treatment on Hydroformability of TRIP Seamless Steel Tube

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Abstract

A low-carbon TRIP seamless steel tube, which is expected to be used in the hydroforming process, was successfully fabricated using piercing, cold-drawing and two-stage heat treatment process. The two-stage heat treatment is one crucial step) because it significantly affects the microstructure and mechanical properties of TRIP seamless steel tube. In order to obtain the TRIP seamless stell tube with high hydroformability, several different heat treatment processes were conducted. The effects of heat treatment conditions (intcrcritical annealing (IA.) and isothermal bainite treatment (IBT)) on the TRIP seamless stell tube hydroformability which was determined by free hydraulic bulge test were analyzed. Two different internal pressure boosting velocities of 0. 2 and 0. 5 MPa./s of free hydraulic bulge testswere adopted to determine the effective stress vs. effective strain curve of TRIP seamless steel tube. The results showed that for the predetermined IA condition, the maximum bulge height increased, but the maximum burst internal pressure decreased, with the increase of IBT holding time from 4 to 6 min. For the predetermined IBT condition, the maximum bulge height decreased, but the maximum burst internal pressure increased, with the increase of IA holding time from 5 to 10 min. By analyzing the free hydraulic bulge test results, it was found that the maximum bulge heights of TRIP seamless steel tubes with the internal pressure boosting velocity of 0. 5 MPa./s were higher than those when the internal pressure boosting velocity was 0.2 MPa/s. This means that an appropriate deformation rate should be chosen to obtain the optimal hydroformability of TRIP seamless steel tube. In addition, the effective stress vs. effective strain curves of TRIP seamless stell tubes were obtained with free hydraulic bulge test.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, Liaoning, 110819, China

    Zi-cheng Zhang (Doctor, Associate Professor)

  2. Department of Mechanical Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, 192-0397, Tokyo, Japan

    Ken-ichi Manabe

Authors
  1. Zi-cheng Zhang
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  2. Ken-ichi Manabe
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Correspondence to Zi-cheng Zhang.

Additional information

Foundation Item:Item Sponsored by National Natural Science Foundation of China (51304046); Grant-in-Aid for Young Scientists (B) of Japan Society for the Promotion of Science!25870594); Fundamental Research Funds for the Central Universities of China (N130403013); Specialized Research Fund for the Doctoral Program ofHigher Education of China (20130042120031); Scientific Research Starting Foundation for Introduced Talents of Northeastern University of China (02090021233002)

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Zhang, Zc., Manabe, Ki. Influence of Heat Treatment on Hydroformability of TRIP Seamless Steel Tube. J. Iron Steel Res. Int. 21, 695–701 (2014). https://doi.org/10.1016/S1006-706X(14)60108-4

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60108-4

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