Entity

Time filter

Source Type


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. Source


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. Source


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. Source


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. Source


Wang Y.-W.,Control Iron and Steel Research Institute, China | Guo Q.,Fushun Special Steel Shares Co. | Kang A.-J.,Fushun Special Steel Shares Co. | 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. Source

Discover hidden collaborations