铌对Cr8Mo2SiV钢组织和性能的影响
Effect of Niobium on Microstructure and Mechanical Properties of Cr8Mo2SiV Die Steel
路 磊， 杨 华
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作者单位：山东大学 材料液固结构演变与加工教育部重点实验室，山东 济南 250061
中文关键字：铌； Cr8Mo2SiV冷作模具钢； 组织； 力学性能
英文关键字：niobium； Cr8Mo2SiV cold work die steel； microstructure； mechanical properties
中文摘要：研究了0.3%~0.9%Nb对铸态及热处理态Cr8Mo2SiV冷作模具钢组织和力学性能的影响。结果表明：铸造Cr8Mo2SiV钢共晶碳化物枝晶粗大，成网状分布于晶界上。随着Nb的加入，钢的铸态组织和共晶碳化物都得以改善，难熔铌的碳化物增多，抑制了奥氏体晶粒长大；经热处理后，钢的共晶碳化物由网状变为粒状和块状分布于基体中，综合力学性能得以改善。
英文摘要：The effects of Nb on the microstructure and mechanical properties of Cr8Mo2SiV cold work die steel were studied. The results show that as-cast Cr8Mo2SiV die steel presents coarse dendrites, and the eutectic carbides are connected each other to form a network along grain boundaries. With the increase of Nb content, the as-cast structure and carbide morphology improves， and the amount of refractory carbides increases remarkably to restrain the growth of austenite grain; after heat treatment, the network carbides in the as-cast die steel change into granule and lump which homogeneously distributes in the matrix. Meanwhile, the combined mechanical properties of the die steel improve.