利用扫描电镜、X 射线衍射分析技术,对比经过 RE-N-C-S-V-Nb 多元共渗处理、气体渗氮处理和淬火+回火处理的 H13 钢三种试样的热疲劳性能,依据裂纹特征、裂纹结构,证明 RE-N-C-S-V-Nb 多元共渗 H13钢具有较强的抗热疲劳性能。 研究了多元共渗钒铌碳氮化物的细晶强化作用和位错强化作用,及其对钢热稳定性、高温硬度和抗氧化性的影响,从理论上揭示了 RE-N-C-S-V-Nb 多元共渗对热疲劳性能的强化机制。

The thermal fatigue properties of three H13 steel samples were investigated by scanning electron microscope ( SEM) and X-ray diffraction ( XRD) . And the samples were treated by multicomponent permeating, gas nitriding, quenching and tempering, respectively. It is indicated that the H13 steel after RE-N-C-S-V-Nb multicomponent permeating treatment has much better thermal fatigue resistance performance according to the crack 爷 s characteristic and structure. The strengthening effects of fine-grain and dislocation by RE-N-C-S-V-Nb multicomponent permeating treatment, and their influence on the thermostability, high temperature hardness and oxidation resistance, are discussed. The strengthening mechanism on the thermal fatigue performance is revealed theoretically.