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Segregation Behaviour and Microstructure of Alloy 718VADER Ingot

Yueguang YU , Jie FU and Xishan XIE(University of Science and Technology Bejing , Beijing , 100083 , China)Jialong XU and Chunyong JING(Shanghai Iron and Steel Research Institute , Shanghai , 200940 , China)

材料科学技术（英文）

The segregation behaviour and miclostructure of an alloy 718 VADER ingot in comparison with a VAR ingot were studied. The results show that one serious problem of the alloy 718 VADER ingot is dealing with radial chemistry gradients (especially macro-segregation in Nb). The main factor of Nb gradient forming is the flow of Nb rich fluid through passages among the cellular structures driven by centrifugal force from the rotating mold, Detailed structure and micro-segregation studies on ingots impress us that the VADER process does not show the advantage on the improvement of micro-segregation especially in Nb. The cellular structure produced by the VADER process is no more effective in reducjng Nb micro-segregation during homogenization treatment than the dendritic structure by the VAR process. Experimental results lead us to believe that the VADER process is unsuitable to manufacture alloy 718.

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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（英文）

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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