Crack Tendency And Stress Generation Of Aluminum Alloy

The cracks are different from hot cracks and cold cracks. Observe the cracks, the appearance is zigzag and irregular, the surface is strongly oxidized, the matte is hot cracks, and the head is cold cracks.

Hot cracking occurs during the solidification of the alloy, that is, most alloys have formed a dendrite skeleton and began to solidify, but there is still a small amount of liquid in the dendrite parts. At this time, the linear shrinkage of the alloy is the largest and the thermal strength of the alloy is very low. The mold hinders its shrinkage and generates shrinkage pressure. When its strain is greater than the allowable strain of the alloy's strength at this temperature, cracks occur.

Cold cracking is that the alloy is severely hindered or subject to external forces when the solid is shrinking, such as premature falling sand or mechanical damage during cleaning. Cold cracking rarely occurs.

When the casting is blocked during the solidification and cooling process in the mold, stress and deformation will occur. The stress is in the range of elastic strength. Residual stress will exist in the casting, reducing the design strength of the casting. The casting will deform during use and processing, affecting the precision and assembly of the casting. .

Casting stress consists of three parts: thermal stress, phase transformation stress and shrinkage stress. The casting stress of die castings can be eliminated by annealing the natural failure of the goods.

Link to this article： Crack Tendency And Stress Generation Of Aluminum Alloy

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:https://www.cncmachiningptj.com/，thanks！

PTJ® provides a full range of Custom Precision cnc machining china services.ISO 9001:2015 &AS-9100 certified. 3, 4 and 5-axis rapid precision CNC machining services including milling, turning to customer specifications,Capable of metal & plastic machined parts with +/-0.005 mm tolerance.Secondary services include CNC and conventional grinding, drilling,die casting,sheet metal and stamping.Providing prototypes, full production runs, technical support and full inspection.Serves the automotive, aerospace, mold&fixture,led lighting,medical,bicycle, and consumer electronics industries. On-time delivery.Tell us a little about your project’s budget and expected delivery time. We will strategize with you to provide the most cost-effective services to help you reach your target,Welcome to Contact us ( sales@pintejin.com ) directly for your new project.