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采用不同温度进行中间热处理,以改变晶界沉淀相的类型、形态和数量。测定了室温和-196℃的冲击韧性。用扫描电镜和电子显微镜观察了冲击断口和断口萃取复型。结果表明,当晶界二次TiC沉淀很少或TiC以薄片状密集分布于晶界时,合金具有缺口敏感性;TiC或Laves相以较大而厚的片状沿晶析出,或以颗粒状分布于晶界时,合金无缺口敏感性. 晶界TiC沉淀很少或呈颗粒状分布时,合金冲击韧性高,呈穿晶韧性断裂;TiC或Laves相呈片状沿晶分布时,冲击值低,冲击试样断口表现为沿晶脆性断裂。
Different temperature intermediate heat treatment to change the grain boundary precipitation phase type, morphology and quantity. Impact toughness was measured at room temperature and -196 ° C. The impact fracture and fracture extraction complexation were observed by scanning electron microscope and electron microscope. The results show that when the secondary TiC precipitates in the grain boundaries are few or the TiC is densely distributed in the form of flakes at the grain boundaries, the alloys have notched sensitivity. TiC or Laves phase precipitates along the larger and thick platelets, The distribution of grain boundaries, the alloy without notch sensitivity. Grain boundary TiC precipitation little or granular distribution, the alloy high impact toughness, was transgranular toughness fracture; TiC or Laves phase sheet distribution along the crystal, the impact value Low, impact specimen fracture along the brittle brittle fracture.