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Influence of Solution Treatment on Impact Toughness and Microstructure of Cobalt-free Maraging Steel

稀有金属材料与工程 2011年第S3期40卷 114-117页

作者： Yu Jianmin1, Li Baocheng1, Zhang Baohong2, Yang Weiyu2 1North University of china, taiyuan 030051, china 2engineering research center of magnesium-base material processing technology, ministry of education, taiyuan 030051, china N Univ china Coll Mat Sci & Engn Taiyuan 030051 Peoples R China Minist Educ Engn Res Ctr Magnesium Base Mat Proc Technol Taiyuan 030051 Peoples R China

The influence of different solution temperature on microstructure and impact toughness of cobalt-free maraging steel 00Ni14Cr3Mo3Ti was investigated by SEM and X-Ray *** experimental results showed that with the solution temperature variation, the martensite morphology has not changed, is still lath *** Laves phase hindered the dislocation movement after 750 ℃ solution heat treatment, which result in a very low impact absorbed energy, the impact fracture has no obvious plastic deformation, with bad *** the solution temperature increased, the undissolved phase gradually dissolved, the impact absorbed energy increased *** the Laves phase dissolved when reach to 900 ℃, the impact absorbed energy reaches the maximum, is 61 *** morphology change from brittle fracture into toughness transgranular fracture with deep dimple. When solution temperature is above 900 ℃, with the solution temperature further increase, austenite grain size increases *** grain diameter of austenite is about 70 μm after 1050 ℃ solution treatment, the density of precipitates on the grain boundary of maraging steel is increase substantially, deformation compatibility deteriorate, which result in the impact absorbed energy decreased *** type becomes transgranular and quasi-cleavage mixed fracture with the characteristics of the river patterns from ductile transgranular fracture.

关键词： cobalt-free maraging steel solution treatment impact toughness separation

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Effects of Multiple Plastic Deformations on Microstruc-ture and Mechanical Properties of 7A04-T6

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稀有金属材料与工程 2011年第S3期40卷 69-72页

作者： Zhang Zhimin1,2, Yu Jianmin1, Wang Qiang2, Zhang Xing 2 1 engineering research center of magnesium-base material processing technology, ministry of education, taiyuan 030051, china 2 North University of china, taiyuan 030051, china Minist Educ Engn Res Ctr Magnesium Base Mat Proc Technol Taiyuan 030051 Peoples R China N Univ china Taiyuan 030051 Peoples R China

The influences of multiple plastic deformations on microstructure and mechanical properties of 7A04-T6 alloy by isothermal compression experiments in different passes deformation on the 6300 kN extrusion press. The experimental results showed that the strength and elongation of 7A04-T6 alloy were increased firstly and then decreased as the deformation pass increases at above 400 ℃. The grains of 7A04-T6 alloy was refined firstly and then grow, the grain was become refinement after four deformations under this experimental conditions. The second phase η (MgZn2) in the matrix would precipitate after solution, precipitation strengthening taking place. It is obvious that the number of second phase which dissolve into the matrix will increase as the deformation pass increasing. So the tensile strength reached the highest after four deformations, is 590.9 MPa, yield strength is 532.5 MPa, and elongation is 12.4%. After four deformations of 7A04-T6 alloy, tensile fracture surface of samples was composed of the deep and uniform dimples, belonging to ductile fracture. Therefore, 7A04-T6 alloy has better comprehensive mechanical properties after four deformations.

关键词： 7A04 high-strength aluminum alloy multiple deformations T6 heat treatment

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The Feasibility Analysis of Decrease the Reverse Reaction Rate in the Carbothermic Reduction of Magnesia in a Vacuum

The Feasibility Analysis of Decrease the Reverse Reaction Ra...

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Mechanical engineering and material Science—2012 International Conference on Mechanical engineering and material Science(MEMS 2012)

In the present work,the behavior of un-coagulable CO was experimentally investigated during the condensation process of carbothermic reduction of magnesia at condensing zone temperatures ranging from 923 K to 1223 *** powders and magnesium lump condensates were produced under different conditions and characterized by scanning electron microscopy and energy-dispersive X-ray *** reverse reaction products C and MgO were formed following the process of magnesium vapor condensation and we just found the nearer the temperature of the condensation zone approached the liquid transition temperature,the lower the rate of the reverse reaction between CO and magnesium ***,decreases in the rate of the reverse reaction of magnesium were possible by controlling the condensation temperature in experiments.

关键词： magnesium Vapor Vacuum Reverse reaction Carbothermic reduction.

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