Effect of Pressure on Dendrite Structure and Characteristics of Carbides during Solidification Process of H13 Die Steel Ingot

In this paper, the effect of solidification pressure on dendrite structure and characteristics carbides in H13 die steel ingot was investigated by experimental calculational methods. Based cooling rate, a formula is proposed to calculate secondary arm spacing: λ2 = 71.45 × R−0.37. It applicable when maximum value around 2 MPa rate between 0.5 3 K/s. With increasing from 0.1 MPa, effects segregation ratio V, Mo, Cr C are little can be neglected, which caused combined equilibrium partition coefficient, diffusion coefficient rate. Therefore, determined decreasing spacing with increment pressure. types not change, MC M2C ingot. Meanwhile, mean area decreases obviously pressure, decrement at edge larger than that center