金属材料内部裂纹高温愈合实验研究

Study on Inner Crack Healing at Elevated Temperature in Metals

摘要: 给出对纯铜和45号及80号优质碳素钢内部裂纹高温愈合处理的一些实验结果.研究表明:内部裂纹愈合过程中存在比较强烈的原子扩散迁移行为,钢中Fe原子更易于向裂纹愈合区扩散迁移;较长裂纹段的愈合可能依赖于一种分隔愈合机制.

Abstract: The results of research on the healing in pure copper and carbon steel are shown herewith. The inner crack could be healed at elevated temperature. It suggests that the healing of long crack could depend on the "separate healing" mechanism, in which forming of partition is an haportant stage. It results in that the long crack transformed into a row of tiny smooth cracks and round holes. The diffusivity of Fe atoms to crack healing area is higher than other elements.