Shijiazhuang, China
Shijiazhuang, China

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Chi H.-X.,Kunming University of Science and Technology | Chi H.-X.,Control Iron and Steel Research Institute, China | Ma D.-S.,Control Iron and Steel Research Institute, China | Yong Q.-L.,Kunming University of Science and Technology | And 4 more authors.
Journal of Iron and Steel Research International | Year: 2010

The effect of cryogenic treatment on the properties of Cr8-type cold work die steel was investigated. The results show that cryogenic treatment increases hardness by decreasing retained austenite, but the degree depends on the austenitizing temperature. When quenching at lower austenitizing temperature, the steel can obtain higher toughness by cryogenic treatment substituting conventional treatment process. Cryogenic time has little effect on cryogenic treatment. Conversely, cryogenic temperature has a great effect on cryogenic treatment and the effect of cryogenic treatment is more obvious with decreasing cryogenic temperature. In addition, deep cryogenic treatment improves the wear resistance by precipitating more homogeneous specific carbides. © 2010 Central Iron and Steel Research Institute.


Chi H.-X.,Kunming University of Science and Technology | Chi H.-X.,Control Iron and Steel Research Institute, China | Ma D.-S.,Control Iron and Steel Research Institute, China | Wu L.-Z.,Heye Special Steel Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

Effects of different heating temperature and holding time on the decomposition behavior of M2C eutectic carbide in M2 high speed steel were investigated by SEM and EDS. The results show that the degree of decomposition of M2C eutectic carbide is increased with the increase of heating temperature and holding time, but the heating temperature plays a main role. The process of decomposition of M2C eutectic carbide was discussed. The characteristics of decomposition are that the decomposition of M2C eutectic carbide is controlled by the diffusion behavior of atoms; the M6 C carbides form in the outer layer of the original M2 C eutectic carbide and the MC carbides form in the inner layer.


Ma D.-S.,Control Iron and Steel Research Institute, China | Chi H.-X.,Control Iron and Steel Research Institute, China | Chi H.-X.,Kunming University of Science and Technology | Yong Q.-L.,Control Iron and Steel Research Institute, China | And 3 more authors.
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

Effect of aluminum on microstructure and mechanical properties of Cr8WMo2V2SiNb steel was investigated by metallographic examination and SEM. The results show that aluminum can refine as-cast microstructure, carbides and grain size. Aluminum also can increase critical point while improving the appearance of ferrite in quenched structure. In addition, aluminum can improve the transformation of retained austenite to martensite and increases the tempered hardness. Moreover, aluminum improves the bending strength and wear resistance in the case of losing a little toughness.


Li X.,Advance Technology and Materials Ltd Company | Zhong H.,Advance Technology and Materials Ltd Company | Wang X.,Advance Technology and Materials Ltd Company | Wu L.,Heye Special Steel Ltd Company | Kuang C.,Advance Technology and Materials Ltd Company
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2012

Precipitation of vanadium carbides in austenite in Fe-V-C system were quantitatively calculated at 1130°C. On the basis of precipitation thermodynamics and kinetics, continuous stages from nucleation to growth and coarsening of carbides were analyzed. A local equilibrium condition was used at the precipitate-matrix interface to derive the growth rate of each precipitate as a function of its size and the current matrix composition. When coarsening occurs, small carbides began to dissolve and big ones keep on growing because of the effect of Gibbs-Thomson, the radius of carbides increase while the number of carbides decreases. The results show that the system is almost in equilibrium state when the isothermal heat treatment time reaches 10 4 second, the volume fraction of carbides is 1.51% and mean radius is 0.72 μm.


Xu H.,Chengdu Chengliang Tools Group Co. | Xu Q.,Chengdu Chengliang Tools Group Co. | Chen L.,Chengdu Chengliang Tools Group Co. | Wu L.,Heye Special Steel Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Contrast tests of the hardness, hot hardness, bending strength and cutting performance of taps quenched and tempered with corresponding materials of M3, M2 and M35 steels were carried out. The results show that the hardness and hot hardness of M3 and M35 steels quenched and tempered are significantly higher than that of the M2 steel, while there is no obvious difference between the M3 and M35 steels. The bending strength of M2 steel is higher than that of the M3 and M35 steels. When quenched at 1160~1180°C, there is of little difference between the bending strength of M3 and M35 steels; when quenched at 1180~1240°C, the bending strength of M3 steel is lower than that of M35 steel; however when quenched above 1220°C, all bending strength of these three steels falls sharply. The quenching temperature range of M2 and M35 steels used for tap is wider than that of M3 steel. The cutting performance of M3 steel tap is best. M3 steel is more suitable to the taps with improving toughness and grinding performance.


Han P.,Hebei University of Science and Technology | Zhang J.,Hebei University of Science and Technology | Wu L.,HEYE Special Steel Co. | You X.D.,HEYE Special Steel Co.
Advanced Materials Research | Year: 2013

The effects of the different heat-treatments on the eutectic carbides in HSS cast strip are studied. The microstructure of the high speed steel(HSS) is analysized by means of optical microscopy and SEM. The results show that the heat treatment can make M2C and M6C metastable phase decompose. After comparison we can find that the optimized heat treatment processing of HSS cast strip is at 1200°Cfor 6 h, under which the fine and uniform carbides can be obtained. © (2013) Trans Tech Publications, Switzerland.


Li X.,Advanced Technology and Materials Ltd Company | Zhong H.,Advanced Technology and Materials Ltd Company | Xin D.,University of Science and Technology Beijing | Wu L.,Heye Special Steel Ltd Company | Kuang C.,Advanced Technology and Materials Ltd Company
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2012

The phase diagram of tool steel AHPV10 (AISI A11) with main composition of C-Fe-Cr-Mo-V was computerized by using software "Thermo-calc". The matrix composition, carbides composition and content of AHPV10 were detected, and the calculated and detected results were well consistent. The calculated phase diagram of AHPV10 describes the phases at different temperature and their precipitation sequence. MC firstly precipitates from the liquid, and the precipitation is largely accelerated by the transformation of liquid to austenite when the temperature drops to 1315°C, the mass fraction of MC is 14% when the temperature reaches 1120°C.


Trademark
HEYE SPECIAL STEEL Co. | Date: 2012-07-24

Steel, unwrought or semi-wrought; steel alloys; cast steel; anti-friction metal; ingots of common metal; blooms (metallurgy); common metals, unwrought or semi-wrought; metals in powder form; steel strip; steel sheets; laths of metal; steel wire; soldering wire of metal; rods of metal for welding; alloys of common metal; sheets and plates of metal.

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