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Zhao X.,Zhengzhou Institute of Aeronautics | Zhao H.,Guizhou ANDA Aviation Forging Co. | Zhang R.,Zhengzhou Institute of Aeronautics
Advanced Materials Research | Year: 2011

To improve the efficiency of process planning, an CAPP system is developed according to the complexity and particularity of process design for large forgings,. The feature functions of the system are analyzed. The key techniques are discussed. The application results show that the process plans of about 70% large forgings are designed by the system and the efficiency of process planning is improved 4-8 times. © 2011 Trans Tech Publications. Source


Zhao X.,Zhengzhou Institute of Aeronautics | Zhao H.,Guizhou ANDA Aviation Forging Co. | Zhang R.,Zhengzhou Institute of Aeronautics
Advanced Materials Research | Year: 2012

The hot deformation behavior of TC18 titanium alloy was studied in alpha-beta phase region. The temperature range was 1023-1123K and strain rate range 1-0.001 -1s -1. The material constants of the alloy, including deformation activation energy ΔH as 364.823kJ / mol, stress-level coefficient α as 0.0086mm 2/ N, stress exponential n as 3.8442 and structural factor A as 1.2601×10 15s -1 were derived by Zener-Hollomon method from the interdependencies of flow stress, strain rate and temperature. © (2012) Trans Tech Publications, Switzerland. Source


Zhao X.,Zhengzhou Institute of Aeronautics | Zhao H.,Guizhou ANDA Aviation Forging Co. | Zhang R.,Zhengzhou Institute of Aeronautics
Advanced Materials Research | Year: 2012

The hot deformation characteristics of TC18 titanium alloy were studied in the temperature range 750-850° and strain rate range 0.001-1 s -1 by using hot compression tests. Processing maps for hot working are developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate. The results reveal that the flow stress of TC18 is sensitive to strain rate. Processing map at stain of 0.6 reveals two domains: one is centered at 750° and 0.001s -1; another is centered at 850° and 0.001s -1. The maximum efficiency is more than 60%. According to the maps, the zone with the temperature range of 750-850° and strain rate range of 0.01-0.001s -1 may be suitable for hot working. © (2012) Trans Tech Publications, Switzerland. Source


Xin X.,Northeastern University China | Xin X.,CAS Shenyang Institute of Metal Research | Sun W.,CAS Shenyang Institute of Metal Research | Duan Z.,Guizhou ANDA Aviation Forging Co. | And 5 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2011

The effects of increasing Al and decreasing Nb on microstructure and mechanical properties of GH706 alloy were studied. With increasing Al from 0.35% to 1.26% and decreasing Nb from 2.88% to 1.98%, the precipitation of γ ″-Ni 3Nb phase is constrained, while the formation of γ'-Ni 3Al phase is promoted. As a result, the tensile strength at room temperature is decreased, but the impact energy is improved. However, such a modification of Al and Nb constrains the precipitation of intergranular η-Ni 3 (Ti, Nb) phase, and enhances the precipitation of Laves phase rich in Nb and Cr 2Nb phase rich in Nb and Cr, which decreases the grain boundary cohesion and deteriorates the stress rupture properties at 650°C and 690 MPa. © 2011, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source


Patent
Guizhou Anda Aviation Forging Co. | Date: 2014-05-23

A method for expanding a rectangular section ring to form a non-rectangular section ring. The method includes heating a rectangular section ring of an alloy to a temperature of between 1000 and 1020 C., preheating an expanding block to a temperature of between 260 and 320 C., nesting the inner circumferential surface of the rectangular section ring on the outer circumferential surface of the expanding block; enabling the expanding block to press the inner circumferential surface of the ring in the radial direction, expanding the inner and outer diameter of the rectangular section ring and decreasing the wall thickness thereof for deforming the rectangular section ring to yield a profiled ring billet, whereby finishing a first expanding; rotating the profiled ring billet for 45 along the central axis, whereby finishing a first rotation; and repeating the expanding process and the rotation to obtain a non-rectangular section ring.

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