The composition of ferrite arrangement that is beneficial for body centered cubic, does not form carbides in steel, and is on the left side of iron in the periodic table, primarily solidly soluble in iron. It has little effect on the diffusion coefficient of carbon in austenite and has little effect on the formation rate of austenite. It can increase the A1 point and relatively slow down the formation rate of austenite. If the austenite grain size is slightly obstructed or ineffective during heating, the pearlite phase transformation can be postponed to shift the C curve to the right, causing the nose on the C curve to move towards the high-temperature area, causing the Ms point to decrease, improving the stability of undercooled austenite, and then decreasing the critical cooling rate for quenching, improving the hardenability of the steel. It can significantly slow down the differentiation of Martensite at a lower temperature, but it does not slow down the differentiation of Martensite when tempering at 400~500 ℃, significantly block the collection of carbides, block the effect of eliminating various distortions of steel when tempering, and generally delay the quenching of steel α The process of phase recovery, recrystallization, and carbide aggregation then suppresses the decrease in hardness and strength of the steel, enhancing its tempering stability. Progressive α The recrystallization temperature of the phase can significantly enhance the tempering brittleness of the steel, and the arrangement of each phase of the steel can be modified by adding the amount of pearlite. The primary purpose is to increase the hardenability of steel, and all quenched parts can achieve high and uniform induced mechanical properties after high-temperature tempering, especially high yield strength ratio, significantly strengthening ferrite, and improving the resistance of steel even on a certain scale.

Can be closed γ When the content of elements in the phase zone reaches a certain amount, γ The phase zone is closed, even if the γ The area shrinks to a very small scale, surpassing this content of alloy attack γ reach α Phase transition is beneficial for the formation of ferrite arrangements with body centered cubic structure. Carbides can be formed in steel, which are transitional transition group elements located on the left side of iron in the periodic table, which can reduce the carbon content at the eutectoid point of steel and reduce the carbon content at the γ The maximum solid solubility in can be achieved by many participants γ The phase zone disappears and all ferrite arrangements are obtained. It is a strengthening element that reduces the diffusion coefficient of carbon in austenite, greatly delaying the transformation process of pearlite to austenite. In steel, the special carbides formed are not easily soluble, which slows down the formation rate of austenite and can increase the A1 point, relatively slowing down the formation rate of austenite. Significantly α The recrystallization temperature of the phase faces the high temperature, which makes the steel show tempering brittleness significantly, and severely blocks the further development of Martensite differentiation. The arrangement of each phase of the steel can be changed, and the amount of pearlite can be added. By increasing the hardenability of steel, all quenched parts can achieve high and uniform induced mechanical properties after high-temperature tempering, especially high yield strength ratio, significantly strengthening ferrite, and improving the durability of steel compared to a certain scale. If special carbides that are difficult to dissolve are formed, if the holding time is insufficient during heating, austenite with extremely uneven composition will be obtained. It has a moderate obstruction effect on the grain size of austenite during heating, which can delay the pearlite phase transformation, reduce the Ms point, improve the stability of undercooled austenite, and then decrease the critical cooling rate for quenching, improving the hardenability of steel. Significantly obstructing the collection of carbides, hindering the effect of steel on eliminating various distortions during tempering, and generally delaying the quenching of steel α The process of phase recovery, recrystallization, and carbide aggregation then suppressed the decrease in hardness and strength of the steel, enhancing the effect of manganese element in 5.3 GCr15 bearing steel

Openable γ If a certain quantity is reached in the phase zone, it can be completely suppressed α The presentation of phase zones, replaced by γ Therefore, if the r region is quenched to room temperature, it is easy to obtain austenite. Progressive α The recrystallization temperature of the phases causes significant tempering brittleness in the steel, and the arrangement of each phase in the steel can be modified by adding the amount of pearlite. Carbides can be formed in steel, which are transitional transition group elements located on the left side of iron in the periodic table. They can reduce A3 and A1, and many of them can even lower A3 to below room temperature. Therefore, the steel still has austenite arrangement at room temperature, which can be modified to change the working temperature. The reduction of A1 point relatively adds superheat, which increases the composition speed of austenite, refines pearlite, and is conducive to austenite composition, The austenite grain size during heating is helpful. It can extend the pearlite phase transformation, reduce the Ms point, improve the stability of undercooled austenite, and then decrease the critical cooling rate for quenching, improving the hardenability of steel. In order to increase the hardenability of steel, all quenched parts can achieve high and uniform induced mechanical properties after high-temperature tempering, especially high yield strength ratio, significantly strengthening ferrite, and improving the resistance of steel even within a certain scale.