Method for preventing cracking of water-quenched edges and angles of rectangular alloy steel member
A technology of alloy steel and corner cracking, which is applied in the direction of quenching agent, furnace type, heat treatment furnace, etc., and can solve problems such as stress increase
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Embodiment 1
[0043] The material to be processed is a medium-carbon alloy steel forging with a size of 5000 (length) * 1500 (width) * 200 (thickness) (mm). It is required that the mechanical properties of the position from the surface to 1 / 4 of the thickness after quenching are higher than the requirements.
[0044] Process: water-air alternately controlled quenching and cooling, the medium is water and air.
[0045] In order to avoid cracking at the edges and corners during the quenching and cooling process, the method (1) for preventing cracking at the edges and corners of rectangular alloy steel parts by water quenching according to the present invention is adopted, that is, the cooling rate of the surface areas other than the edges and corners is increased. , reduce the temperature difference between the surface area outside the edge and corner and the edge and corner, and reduce the tensile stress at the junction.
[0046] The specific method is to take rapid cooling measures on the s...
Embodiment 2
[0052] The material to be processed is medium carbon alloy steel, and the size is 5000 (length) * 1500 (width) * 200 (thickness) (mm). It is required that the mechanical properties of the position from the surface to 1 / 4 of the thickness after quenching are higher than the requirements.
[0053] Process: one-time immersion quenching and cooling. The quenching medium is: polymer water-soluble quenching medium
[0054] In order to avoid cracking at the sides and corners during quenching and cooling, the method (2) of the present invention for preventing cracks at the sides and corners of rectangular alloy steel parts by water quenching is adopted, namely: reduce the cooling rate at the sides and corners and reduce the size of the sides. , the temperature difference between the corner and the edge, and the surface area outside the angle, and reduce the tensile stress at the junction of the edge, angle and the edge, and the surface area outside the angle.
[0055] The specific me...
Embodiment 3
[0058] The material to be processed is medium carbon alloy steel, and the size is 5000 (length) * 1500 (width) * 200 (thickness) (mm). It is required that the mechanical properties of the position from the surface to 1 / 4 of the thickness after quenching are higher than the requirements.
[0059] Process: water-air alternately controlled quenching and cooling, the medium is water and air.
[0060] In order to avoid cracking of the edges and corners during the quenching and cooling process, the method (3) of the present invention for preventing cracking of the edges and corners of rectangular alloy steel parts by water quenching is adopted, that is, the self-tempering time is increased by setting the quenching and cooling process , reduce the supersaturation of carbon in the edge and angle martensite that has undergone martensitic transformation, and improve the ability of the edge and angle to resist cracking.
[0061] The specific method is to properly prolong the air cooling ...
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