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Solutions for Cracking or Distortion of the Shape of Workpiece after Quenching Process
To prevent the workpiece cracking and to reduce the shape distortion after quenching process. Solutions to prevent cracking are as follows:
1. Workpiece design
The shape of the workpiece to be as simple as possible, symmetrical, try to avoid a sudden change in cross-sectional size, do not have sharp edges and corners. Otherwise, the workpiece is not only easy to produce the shape of quenching distortion, and easy to crack.
2. Selection
The shape of complex, easy to produce the shape of distortion and cracking of the workpiece should be used high-hardenability alloy steel in order to lower the cooling capacity of the cooling medium or quenching quenching in order to reduce the internal stress generated during quenching .
3. Forging and Preliminary Heat Treatment
The manufacture of cross-sectional size of the larger alloy steel and high alloy steel forging parts of the workpiece must be repeated upsetting stretching, in order to better eliminate dendritic segregation and carbide segregation. Should be carefully carried out normalizing and annealing, the elimination of mesh and horn carbide, refine the workpiece before the quenching of the original organization of steel. Segregation and other undesirable original organization will make the workpiece quenched shape distortion increased, cracking tendency to increase.
4. Heating
Workpiece furnace should be installed to avoid heating one side. Should pay attention to flat, so as to avoid deformation at high temperatures due to weight. Slender rods and shaft parts are preferably heated in a pit or salt bath. Large workpiece, high-alloy steel workpiece, uneven thickness of the workpiece should be segmented heating or preheating method to reduce the heating rate, reduce the temperature difference between the various parts in order to reduce the workpiece due to uneven heating caused by the shape distortion. Thin-walled rings and the like are easy to produce the shape of the cooling distortion of the parts into the appropriate fixture in the heating and cooling can reduce the shape distortion. Heating the temperature to take the lower limit, can make austenite grain is small, the quenching of the workpiece shape distortion can be weakened, cracking tendency is also reduced. High carbon steel surface decarburization easy to produce surface cracks in the cooling, high carbon steel workpiece quenching should pay attention to prevent decarburization. Do not harden the blind hole should be installed in the workpiece with asbestos rope before the block, so as to avoid cracking from the cooling here.
5. Cooling operation
In order to reduce the shape distortion, quenching the workpiece immersed in the cooling medium as much as possible so that the various parts of the uniform cooling, while the media so that the resistance of the workpiece immersion resistance as small as possible.
6. Straightening 
Usually after the workpiece is cooled to room temperature or tempering.

7. Crack inspection 

Under normal circumstances the surface cracks can be seen with the naked eye. In order to more clearly show the cracks, kerosene can be used to clean the workpiece, dry after the end of a layer of chalk coated, then the cracks will appear as a wet stripes. Important parts can be used for testing a variety of testing methods.

Shiyan Hengjin induction is committed to creating efficient workpiece induction hardening solutions, induction hardening equipment can be applied to all types of steel induction hardening process. Equipment can be customized according to the requirements of the workpiece and production efficiency.

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