Study Of The Effects Of Alloy Elements And The Natures Of Steel Matrix In 12Cr1MoV

The situations of low alloy heat-resistant steel (12Cr1MoV) after high temperature operation are measured comprehensively by Larson? Miller parameter ( P parameter ) .By high-temperature simulation in laboratory and hardness test, it is established that material hardness decreases with P parameter increasing, which is also correspond with test results of industrial operation. Seeing that the Empirical Electron Theory of Solid and Molecules EET(Yu's theory) is helpful to the research of quantitative analysis for complex material systems, in the paper, the major valence electron structures in 12Cr1MoV steel have been analyzed and given by using the Yu's theory. In addition, valence electron structure parameters of various structure units from atmospheric temperature to high temperature are calculated. From the level of valence structures, not only the effects of temperature on material strength are analyzed , but also the behaviors and influences of alloy elements are discussed. It is placed emphases on the problems of strengthening effects of alloy elements on steel matrix, the poorness of alloy elements, the influences of alloy elements on self? diffusion of Fe and recrystallization temperatures of low alloy heat? resistant steel, etc. Besides, the probable diffusion passageway is put forward. The strengthening effects of octahedron body centered carbon on matrix and the functions of alloy elements in structural unit with carbon are analyzed. And the forming of carbonides, the using temperature of the common low alloy heat-resistant steels and the performances of 12Cr1MoV after high temperature aging are discussed. Through analyzing and discussing above, the knowledge of the behaviors and effects of heat-resistant steels with low carbon and alloy can be expanded to the level of valence electron structures of materials.