论文部分内容阅读
根据金相和断口萃取复型的电子显微镜观察,GH131合金900℃瞬时拉伸塑性(δ%)偏低是由于晶界上形成xx续的NbC薄膜。热处理工艺试验结果表明,其δ偏低的管坯经1160℃1hr炉冷至1050℃保温2～4hr空冷处理后,晶界上NbC薄膜基本消失,而析出一定数量中等尺寸的M_sC颗粒,消除了合金中温(700～900℃)的低塑性区。由统计分析得出,连续的NbC薄膜的形成可能是由于碳含量偏低所致,该合金的碳含量最好控制在_.07%(Wt%)以上
According to the observation of the metallographic and fracture extraction complex microscopy, the transient plastic ductility (δ%) of GH131 alloy at 900 ℃ is due to the formation of xx-continuous NbC films on the grain boundaries. Heat treatment process test results show that the low δ body of the tube by 1160 ℃ 1hr furnace cooled to 1050 ℃ heat preservation 2 ~ 4hr air cooling, the grain boundary NbC film disappeared, and the precipitation of a certain number of medium-sized M_sC particles, eliminating Alloy temperature (700 ~ 900 ℃) low plastic zone. The statistical analysis shows that the formation of continuous NbC thin films may be caused by the low carbon content, and the carbon content of the alloy is preferably controlled above 0.07% (Wt%)