In the high temperature of bearing steel alloy elements

Alloying elements in the precision of rolling bearing high temperature bearing steel alloy elements in precision high temperature bearing the role of high temperature of rolling bearing steel 1. Gcr15 bearing steel high temperature silicon role in favor of body centered cubic, no organization formed in the steel carbide ferrite formation, described in the periodic table, mostly in the solid solution of iron. Diffusion coefficient of carbon in austenite on the smaller, the effect of austenite formation speed of little or no effect, point A1 can increase, slow down the rate of austenite formed relatively. When heated to a temperature slightly hinder or invalid, can delay a C - Pearlite transformation curve moves to the right, the austenitic grain size, made in the direction of the curve of the high temperature area C nose, reduce Ms points, improve the stability of supercooling ostwald, which reduces the critical cooling quenching speed, improve the hardenability of steel. Can be resolved in the martensite in the low temperature significantly slowed, but does not slow down the decomposition of martensite in tempering 400? 500 ℃, significantly hinder the aggregation carbide block all kinds of steel tempering distortion effect of eliminating, and usually has a delay of phase alpha reply hardened steel, carbide and recrystallization process, thus inhibiting the lower hardness and strength of steel, improving steel tempering stability. Alloy elements in precision high temperature bearing the role of high temperature of rolling bearing steel 2. Effect of the high temperature of chromium bearing steel GCr15 steel can be closed in gamma phase element, content can be achieved through a certain amount, the gamma phase region was closed, even if the phase diagram gamma area shrink into a small range, more than the content of gamma to alpha phase transformation in the alloy material, favorable for the formation of body centered cubic ferrite organization. Can be formed in the process of carbide in the steel, as excessive group elements during the period of social transition, is located in the left side of the iron in the periodic table, can reduce the eutectoid point carbon content of steel and the solid solubility of carbon in the gamma, a large number of China's accession to we can make the gamma phase disappears, enterprise organization all ferrite. Is strengthening cultural elements formation, lower diffusion coefficient of correlation of carbon in austenite, thus can greatly delayed the pearlite to austenite structure teaching process, due to the special part of the students to form carbide in the steel has not completely dissolved, will make the austenite gradually formed a certain growth rate slows, can increase point A1, relatively slow down the formation of austenite learning speed. Significant to alpha phase characteristics of recrystallization temperature ceaselessly to the high temperature, make the obvious problems in steel tempering brittleness, strong to prevent the further research and development of martensite begins to decompose, can change the organization, each phase of steel increase number of pearlite. Alloy elements in the precision of rolling bearing high temperature bearing steel by improve the hardenability of steel, all hardware after high temperature tempering, quenching can obtain high, uniform mechanical properties, especially high showed significantly strengthened ferrite, within a certain range to improve the toughness of the steel. If special carbide formed dissolves hard, heating heat preservation time is not enough, will get composition is highly uniform austenite. Can delay the pearlite phase transformation, reduce ms points, improve the stability of the supercooled austenite, and reduces the critical of the quenching cooling rate, improve the hardenability of steel. A: before installation of high temperature bearing, several preparations for the next article: none