Liu M.,Tsinghua University |
Dong X.-L.,Angang Heavy Machine Co. |
Ma Q.-X.,Tsinghua University
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2013
Aiming at the disadvantages of low utilization ratio of steel ingot and long production period in the solid ingot forging process of heavy cylinder forging such as reactor pressure vessel, a new forging process using hollow steel ingot was investigated. By means of modeling of lead sample and DEFORM-3D numerical simulation, the deformation law for hollow steel ingot in the processes of upsetting, mandrel drawing and mandrel broaching at different reduction ratios, mandrel diameters, anvil widths, mandrel rotation angles, anvil overlappings and anvil distributions was investigated. And the effective way to avoid hollow forging defects was found. The research results can provide reference for the hollow steel ingot forging process establishing of national heavy cylinder forgings.
Sun F.-X.,Angang Heavy Machine Co. |
Wang P.,CAS Shenyang Institute of Metal Research |
Kang X.-H.,CAS Shenyang Institute of Metal Research
Zhuzao/Foundry | Year: 2010
A ring riser and a "naturally pressurized" gating system were designed for huge water turbine runner band used in the Three Gorges according to its structure. ProCAST software was used to calculate the flow, temperature and stress/strain of the band with the riser and gating system. The simulation results indicate there is no gas and inclusions entrainment during the filling and the ring riser ensures the uniform cooling rate of the band parts at the same height. The stress/strain calculation shows that the middle height part of the band has a bigger shrinkage displacement along the radial direction than other parts of the band, and the external part of the ring riser has a bigger shrinkage along the axial direction than the inside part.
Kan Y.,Dalian University of Technology |
Kan Y.,CAS Shenyang Institute of Metal Research |
Zhang S.-H.,CAS Shenyang Institute of Metal Research |
Zhang L.-W.,Dalian University of Technology |
And 3 more authors.
Journal of Iron and Steel Research International | Year: 2014
The healing behavior of micropores in powder metallurgy (P/M) 316L stainless steel during hot forging and subsequent heat treatment was studied. The results showed that hot forging can improve the homogeneity of the pore size and enhance the relative density of material in varying degree due to different forging temperatures. As a result of deformation and diffusion bonding at high temperature, the irregular pores were spheroidized and finally turned into stable inner grain pores. The comparison of compression behavior between P/M and wrought dense materials has shown that the pores can either be the obstacles of dislocation movement or be the nucleation sites accelerating the recrystallization according to the difference of deformation temperatures. © 2014 Central Iron and Steel Research Institute.
Dong X.-L.,Angang Heavy Machine Co. |
Gao Y.-Q.,Angang Heavy Machine Co. |
Gao Y.,Angang Heavy Machine Co. |
Pang Z.-X.,Angang Heavy Machine Co.
Zhuzao/Foundry | Year: 2013
Under vacuum condition, intense reaction on C and O will occur in molten steel by controlling the content of main deoxidation elements Si, Al. The effects further reduce the content of oxide inclusions, gas in large steel ingots and thus result in a high purified level. In this paper, a series of high purified steel ingots, which serve as hydrogenation and electric power forging products, have been produced with the results of T[O] ≤ 15×10-6, [H] < 1×10-6 by double vacuum carbon deoxidation (DVCD) smelt and pouring steelmaking process. The results show that as a mean of molten steel purification, vacuum carbon deoxidation can effectively improve purity degree of large steel ingots; vacuum casting system of tundish adopting amenable slide gate nozzle can also produce high purified large steel ingot in vacuum carbon deoxidation; an effective vacuum carbon deoxidation can be obtained by only controlling [Al] content of molten steel for 55 A.