For our SCZY Investment Casting Parts, we do Carbon Steel Casting, Stainless Steel Casting, as well as other Specialty Alloy Casting. Today we are going to discuss about other low alloy Steel Casting parts. And we will focus on Analysis and Solution of Hot Cracking of Low Alloy Steel in Investment Casting now. Due to the large segregation of elements and poor thermal conductivity in low-alloy steel, there is a serious tendency to crack. Aiming at the cracks, shrinkage cavities and shrinkage porosity problems in investment casting of lock-seat steel castings, ProCAST software is used to simulate and analyze, and the defects are solved by improving the pouring scheme and verification. The results show that shrinkage cavities, shrinkage porosity and crack defects are more likely to occur in the positions with lower Niyama value and longer solidification time, and the comprehensive use of solidification time and Niyama criterion can more accurately determine the location of casting defects. Due to the particularity of the process, investment casting is affected by many factors such as process flow, molding method, mold characteristics, etc., so complex sprues, runners, risers, and cold iron, heating blocks, etc. cannot be set up. . Therefore, during the cooling and solidification process of the alloy, the feeding of the molten metal is limited to a certain extent. In addition, the melting point of the cast steel alloy is very high, and the casting is prone to hot cracking defects. This is a difficult problem to solve in the investment casting industry.

How to prevent this problem to happen frequently? Our SCZY team has accumulated rich experience. For example,we will reduce the difference in wall thickness of castings, avoid sharp transitions at the junction of thick and thin walls, increase the radius of fillets, set process ribs, reduce hot spots, diffuse hot spots, etc. What's more, we will reasonably design the gating system, such as appropriately increasing the sprue cup, thickening the sprue rod, etc. By increasing the heat capacity of the gate, which can ensure uniform cooling of all parts during the solidification process, eliminate obstacles during shrinkage, and ensure sufficient and timely feeding. All these solutions can be reference. For more information, you can feel free to contact by mail: sandy@sczyltd.com.

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