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Effects of Mg on Mechanical Properties of 35CrNi3MoV Steel

Yueguang YU , Jie FU , Anren WANG and Boping CHEN (University of Science & Technology Beijing , Beijing 100083 , China)(Beijing General Research Institute of Mining & Metallurgy , Beijing 100044 , China)Wenshan SUN(Inner Mongolia Metallic Materials Research Ins

材料科学技术（英）

The effects of Mg on the mechanical properties of 35CrNi3MoV steel has been studied in this paper. The results show that Mg has less effect on the tensile properties and hardness of the steel at room temperature, but a right amount of Mg improves impact and fracture toughness and decreases the fracture-transition temperature considerably due to inclusions modification, as well as prolongs the notch stress rupture life dramatically through strengthening grain boundary and modifying boundary carbides. There is an optimum Mg content, which is about 0.0030% in the experimental 35CrNi3MoV steel

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Precipitation Behavior of TiN in Bearing Steel

Deguang ZHOU , Jie FU , Xichun CHEN , Jing LI

材料科学技术（英）

The precipitation behavior of titanium nitride (TiN) in bearing steel and effects of TiN inclusions on quality of the steel have been studied by thermodynamic calculation and experiment. The results show that with the increase of the content of Ti and [N], the properties of bearing steel decreased; adjusting the content of N and Ti could influence the precipitation occasion and condition of TiN in the steels. If Ti content is less than 30×10-6 and nitrogen content is less than 53×10-6, the temperature of TiN precipitation is under the solidus temperature and the size is small so that they have little harmful and even beneficial effect on the properties owing to grain refinement.

关键词: Bearing steel , null , null

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