The principle of preventing crack
1. There have many kinds of refractory products in our factory, such as fire brick china, refractory products, calcium silicate products, castable, etc. Chemical components of material should strictly comply with the standards of harmful elements,such as S, P, O, N, CU, AL and other easy to form inclusion elements and An, Sb and other trace elements should be controlled. For example: 1Cr18Ni9Ti austenitic stainless steel, because Ti content exceed the standard will lead to steel ferrite’s increases that caused by forging crack.
2. To strictly control the smelting and casting process. This is to improve the purity of steel, eliminate the metallurgical defects, an important link to prevent crack will occur. Practice has proved that the inclusions in steel and presents lumpy aggregation, coarse grain and grain boundary fragility and blank with micro crack and subcutaneous bubbles, cracks easily damaged.
3. When forging, it is necessary to maintain a good stress state, such as changing the free forging punching into die extrusion forming to improve the stress state, so as to prevent the formation of cracks.
4. Strictly control the deformation temperature. Low temperature hardening, serious plastic decrease; the temperature is too high, overheated, burning, plastic will fall, will be?likely to produce cracks. Only fully of recrystallization interval in softening, is generally a single organization, less possibility of forging crack.
5. Deformation rate has a great impact on the low plasticity material, should be based on the specific material selection of suitable forging equipment, in order to prevent the fracture, such as forged MB5 magnesium alloy in the hammer is easy to crack, and in the press forging is not cracked, the reason is the recrystallization of magnesium alloy under high speed slow, easy deformation and easily broken. Changxing refractory provides refractory products, calcium silicate products, castable & mortar, refractory fire brick, ladle & tundish nozzle, ceramic fiber with high quality for you.
2. To strictly control the smelting and casting process. This is to improve the purity of steel, eliminate the metallurgical defects, an important link to prevent crack will occur. Practice has proved that the inclusions in steel and presents lumpy aggregation, coarse grain and grain boundary fragility and blank with micro crack and subcutaneous bubbles, cracks easily damaged.
3. When forging, it is necessary to maintain a good stress state, such as changing the free forging punching into die extrusion forming to improve the stress state, so as to prevent the formation of cracks.
4. Strictly control the deformation temperature. Low temperature hardening, serious plastic decrease; the temperature is too high, overheated, burning, plastic will fall, will be?likely to produce cracks. Only fully of recrystallization interval in softening, is generally a single organization, less possibility of forging crack.
5. Deformation rate has a great impact on the low plasticity material, should be based on the specific material selection of suitable forging equipment, in order to prevent the fracture, such as forged MB5 magnesium alloy in the hammer is easy to crack, and in the press forging is not cracked, the reason is the recrystallization of magnesium alloy under high speed slow, easy deformation and easily broken. Changxing refractory provides refractory products, calcium silicate products, castable & mortar, refractory fire brick, ladle & tundish nozzle, ceramic fiber with high quality for you.
Article Source:Prevention and elimination of forging cracks(1)
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/
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