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利用光学金相技术和蠕变断裂试验研究了碳对ＨＰ－Ｎｂ合金显微组织和蠕变断裂强度的影响。在Ｎｂ含量一定情况下，随着含碳量的增加共晶Ｍ＿７Ｃ＿３增加、共晶ＮｂＣ基本不变，晶内二次碳化物沉淀数量增多，沉淀和粗化速度加快。含碳量与蠕变断裂强度的关系表现为具有极大值特征，含碳在０．４５％～０．５５％（ｍ／ｍ）时蠕变断裂强度最高。
The effects of carbon on the microstructure and creep rupture strength of HP-Nb alloy were investigated by means of optical metallography and creep rupture test. With the increase of carbon content, the amount of eutectic M_7C_3 increases with the increase of carbon content, and the eutectic NbC basically remains unchanged. The amount of secondary carbide precipitates increases and the precipitation and coarsening speed increases with the increase of carbon content. The relationship between carbon content and creep rupture strength shows the maximum value. The creep rupture strength is the highest when the carbon content is 0.45% ~ 0.55% (m / m).