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Guizhou, China

Hussain M.Z.,Northwestern Polytechnical University | Li F.,Northwestern Polytechnical University | Wang J.,Northwestern Polytechnical University | Yuan Z.,Northwestern Polytechnical University | And 3 more authors.
Journal of Materials Engineering and Performance | Year: 2015

The present study comprises the determination of constitutive relationship for thermo-mechanical processing of INCONEL 718 through double multivariate nonlinear regression, a newly developed approach which not only considers the effect of strain, strain rate, and temperature on flow stress but also explains the interaction effect of these thermo-mechanical parameters on flow behavior of the alloy. Hot isothermal compression experiments were performed on Gleeble-3500 thermo-mechanical testing machine in the temperature range of 1153 to 1333 K within the strain rate range of 0.001 to 10 s−1. The deformation behavior of INCONEL 718 is analyzed and summarized by establishing the high temperature deformation constitutive equation. The calculated correlation coefficient (R) and average absolute relative error (AARE) underline the precision of proposed constitutive model. © 2015, ASM International. Source


Li Q.,Northwestern Polytechnical University | Ma Z.,Northwestern Polytechnical University | Liu T.,Beijing Xinghang Mechanical and Equipment Plant | Li F.,Northwestern Polytechnical University | And 2 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2014

Recently, rolling technique used to manufacture rings with various dimensions, shapes, and materials is innovated to a revolutionary technique for the fabrication of large disks. In this paper, in order to study the forming capability of this novel method, its principle was introduced, and the 3D thermomechanically coupled FE model was established using the dynamic explicit code ABAQUS/Explicit. Considering the adaptive treatment of boundary conditions, the user subroutines of ABAQUS were explored based on the movement law of the guide rolls and profiled axial rolls, and contacts between these rolls and the disk component. And the reliability of the FE model was verified theoretically and experimentally. Furthermore, the extending rule of plastic deformation zone and the effect of feed speed on the size of both the outer and inner diameters were investigated. The main results show that (1) the smallest equivalent plastic strain (PEEQ) occurs at the hub of the disk and the junction of the rim and the web, and the larger PEEQ appears on the outer surface of the rim and the web of disk. (2) Both the outer and inner diameters of the disk increase gradually at the beginning stage and more and more rapidly at a later stage. With the increase of the feed rate, the increase rate of both the outer diameter and inner diameter will decrease and the lateral spread rate will increase. And trial production of the large disk based on the analysis had been carried out successfully on the revamped Wagner RAW500/400 radial-axial ring rolling mill. © 2014 Springer-Verlag London. Source


Li Q.,Northwestern Polytechnical University | Wu L.,Northwestern Polytechnical University | Li F.,Northwestern Polytechnical University | Liu T.,Northwestern Polytechnical University | And 3 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2012

Roll forming is a flexible and low-cost technique for manufacturing axisymmetric parts. The disk-rolling process using the revamped radial-axial ring rolling mill has been developed from the radial-axial ring rolling process. This paper introduces the disk-rolling process in detail. Experiments of rolling process for heavy hollow disks were carried out on the revamped Wagner RAW500/400 ring rolling mill. Qualified heavy disks of Q235 steel and 0Cr11Ni2MoVNb steel were successful rolled. The interrelations of billets and disks dimensions were researched on these experiments. It was found that all the qualified disks have a big section spread. Furthermore, the expansion of the inner hole diameter and the outer diameter of the disk during the rolling process were studied. The result indicates that, in order to roll a qualified disk, there must be enough section spread deformation for the billet. © 2012 Springer-Verlag London Limited. Source

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