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Kan Z.,Northeastern University China | Kan Z.,Fushun Special Steel Shares Co. | Du L.-X.,Northeastern University China | Hu J.,Northeastern University China | Weng L.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2017

The microstructures of GH4720Li alloy samples which were cut from GH4720Li alloy bar including forging and heat treatment states were observed, and the phase compositions of primary γ' was measured via energy spectrum analysis. The tensile properties of the samples through heat treatment were tested at 20 and 650℃. The results indicated that the quantity of primary γ' of GH4720Li alloy decreases from the edge to the center of the bar while the size of primary γ' increases gradually. The influence of heat treatment on the quantity and distribution of primary γ' is not noticeable, but the influence of heat treatment on the quantity and distribution of secondary γ' is noticeable. The tensile strength of GH4720Li alloy increases at the first and decreases in the end from the edge to the center of the bar, but the plasticity of alloy increases gradually. The quantity and plasticity of primary γ' are the chief factors influencing the alloy plasticity. The phase boundary of primary γ'-γ is the crack source in the tensile tests. As the precipitation temperature rises, the plasticity of primary γ' increase, the element contents of aluminum and titanium in the primary γ' decrease, but the element contents of chromium, cobalt, molybdenum and tungsten in the primary γ' increase. © 2017, Editorial Department of Journal of Northeastern University. All right reserved.


Dong F.,Inner Mongolia University of Science and Technology | Cai G.,Fushun Special Steel Shares Co.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2010

The changes in the strength, ductility and impact toughness of 202 stainless steel with different contents of Ce element were investigated through the mechanical performance testing, metallographic, SEM and EDS. The mechanical properties of 202 stainless steel with different contents of Ce were compared with those of the 202 stainless steel without Ce addition under the same heat treatment process. The results showed that the inclusion morphology was changed by adding Ce in the 202 stainless steel. And the strength, ductility and impact toughness of 202 stainless steel were obviously improved when added a proper content of Ce. The 202 stainless steel with of 0.016% Ce in mass fraction had the best mechanical properties.


Dong F.,Inner Mongolia University of Science and Technology | Cai G.-J.,Fushun Special Steel Shares Co. | Chu S.-J.,University of Science and Technology Beijing
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

Effects of rare earth Ce on the hardness, strength, ductility and impact toughness of 1Cr18Mn8Ni5N stainless steel was studied through mechanical performance testing, metallographic, SEM and EDS. The mechanical properties of 1Cr18Mn8Ni5N stainless steel with different contents of Ce were compared with those of the 1Cr18Mn8Ni5N stainless steel without Ce addition under the same heat treatment process. The results show that the hardness, strength, ductility and impact toughness of 1Cr18Mn8Ni5N stainless steel are obviously improved when added a proper content of RE Ce element. The 1Cr18Mn8Ni5N stainless steel with RE Ce element of 0.016% in mass fraction has the best mechanical properties.


Gao Z.-W.,Zhejiang Institute of Mechanical and Electrical Engineering | Wang R.-Q.,Zhejiang Institute of Mechanical and Electrical Engineering | Zhang H.-Z.,Hangzhou Steam Turbine Co. | Wang J.-F.,Fushun Special Steel Shares Co.
Zhuzao/Foundry | Year: 2014

Comparing with normal casting process, adopting insulating pads design and chills set in concentrated feeding process of medium carbon alloy steel castings (rollers) has decreased the amount of risers from 8 to 2 while the yield of casting has improved from 58% to 73%. This process design can not only save iron melt, but also reduce casting cleaning work in the later stage. At the same time, CAE software was used to optimize and verify the process by setting casting process parameters. The production shows that the process meets the requirements of casting quality and enables current casting production conditions to produce qualified castings successfully. ©, 2014, Zhuzao/Foundry. All right reserved.


Qu Y.-H.,Polytechnic University of Mozambique | Wang F.,Polytechnic University of Mozambique | Liang T.,Polytechnic University of Mozambique | Jiang X.,China National Petroleum Corporation | Wang J.-F.,Fushun Special Steel Shares Co.
Zhuzao/Foundry | Year: 2014

The groove ledge of scraper conveyer was steel castings made of ZG30MnSi. The filling and solidification process of groove ledge was simulated by ProCAST software, and the position of shrinkage and dispersed shrinkage in castings were predicted. The optimal process is obtained by improving pouring system, riser and chill. The final casting technology was determined for manufacturing of high quality groove ledge.


Wang Y.-W.,Control Iron and Steel Research Institute, China | Guo Q.,Fushun Special Steel Shares Co Ltd. | Kang A.-J.,Fushun Special Steel Shares Co Ltd. | Ma D.-S.,Control Iron and Steel Research Institute, China | Dong H.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2011

Structure of plastic mould steel 3Cr2MnNiMo with thickness 800 mm, treated by quenching and high temperature tempering, composed of tempered sorbite, tempered low bainite and granular bainite. Alloying element segregation result in inhomogeneous structure and local microhardness increase with segregation level increased. Three-dimensional map of specimen treated by mechanically-polished shows that surface rising while probe entering to segregation spot, local smoothness of granular bainite and tempered low bainite are highest and lowest respectively. Uniformity of microhardness improved significantly after high temperature diffusion annealing.


Zhang D.,University of Science and Technology Beijing | Zhou L.Y.,University of Science and Technology Beijing | Zhang C.L.,University of Science and Technology Beijing | Huang C.,University of Science and Technology Beijing | And 2 more authors.
Materials Science Forum | Year: 2015

Network carbide inheritance during heat treatment process of large shield machine bearing steel GCr15SiMn was investigated by heat treatment experiments and quantitative metallographic. Samples with the proeutectoid cementite network thickness in the range of 0.19~0.54 μm were obtained by changing austenitizing temperature and soaking time of pearlite transformation. The results show that the network in hot rolled bar can be improved when the pre-heat treatment temperature is 950 oC. When the network thickness is above 0.40 μm, the undissolved cementite networks present in microstructures after quenching and tempering. In a Chinese standard, the network grades are 1.5 and 3.0 degree when the networks thickness are 0.40 μm and 0.54 μm, respectively. The critical network thickness that can be eliminated by heat treatment is 0.29 μm. © (2015) Trans Tech Publications, Switzerland.


Zhang L.,Fushun Special Steel Shares Co. | Li J.,Fushun Special Steel Shares Co. | Chen D.,Fushun Special Steel Shares Co. | Guo R.,Fushun Special Steel Shares Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Chemical composition of X22CrMoV12-1 steel was optimized and heat treatment processes of the steel were studied. The results show that at the same tempering temperature, the small change of the quenching temperature has little effect on the mechanical properties at room temperature, while as tempering temperature increase, the toughness of the steel is improved, and the strength decrease at the same quenching temperature. The steel can get excellent comprehensive mechanical properties when quenched at 1020 ℃ and then tempered at 690 ℃, which can be used to production. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Liu Z.-B.,Control Iron and Steel Research Institute, China | Yang Z.-Y.,Control Iron and Steel Research Institute, China | Liang J.-X.,Control Iron and Steel Research Institute, China | Zhang X.-L.,Fushun Special Steel Shares Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

The growth behavior and precipitation of reverted austenite in Cr-Ni-Co-Mo marageing stainless steel were investigated. The results show that the strength of the steel aged at 540 °C for 4 h reaches up to 1940 MPa, and the thin-film shape reverted austenite precipitates at the boundaries of lath martensite, so that a good combination of strength and toughness of the steel is obtained. In early aging stage, the reverted austenite precipitates firstly at lath martensite, the boundaries of lath martensite or prior austenitic grain boundary, with prolonging aging time, the thin-film reverted austenite grows up into blocky austenite by atomic diffusion, the orientation relationship between the reverted austenite and martensite is K-S or N-W.


Pang Q.-H.,University of Science and Technology Beijing | Zhang J.-L.,University of Science and Technology Beijing | Mao R.,University of Science and Technology Beijing | Jiang Z.,University of Science and Technology Beijing | Liu T.,Fushun Special Steel Shares Co.
Journal of Iron and Steel Research International | Year: 2014

The mechanism of microwave modification on facilitating the combustion properties of pulverized coal (PC) was investigated. Experimental researches on granularity and functional group as well as combustion properties of PC before and after modification were carried out. Micromorphology observation indicated that the size of PC particles was relatively small, which was in accordance with the results of granularity analysis of PC. FT-IR (Fourier-transform infrared) spectra of two PCs indicated that the proportion of the functional groups with high activity increased after microwave irradiation. Furthermore, no valid effect of microwave was found on carbon matrix except small variations in PC particle size, which only led to subtle improvement in combustion of residual coke. Activation energies of Yungang and Yangquan PCs in temperature zone between 450-650 °C were reduced by 12.00% and 10.13%, respectively, which meant that microwave modification might effectively facilitate the combustion properties of PC. Nevertheless, decrease in activation energies of residual cokes was 3.56% and 3.67% respectively, which was subtle and can be regarded as the result of smaller particle size produced by microwave irradiation. © 2014 Central Iron and Steel Research Institute.

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