Inconel600合金管冷拉拔开裂原因

Cause of Cracking of Inconel600 Alloy Tube after Cold Drawing

固溶与冷轧处理后的Inconel600合金管经多次冷拉拔后出现纵向开裂,从显微组织、非金属夹杂物、开裂形貌、力学性能、工艺性能、固溶处理等方面研究了Inconel600合金管开裂的原因。结果表明:Inconel600合金管中氮含量较高,在熔炼过程中形成了较多氧化物和氮化物,在冷拉拔前的冷轧过程中氧化物和氮化物呈链状沿轧制方向分布,尺寸较大的链状夹杂物破坏了基体的均匀连续性,在反复拉拔过程中应力在夹杂物处集中,导致微裂纹在此处萌生并扩展,最终导致合金管的纵向开裂。

Inconel600 alloy tube treated by solution and cold rolling cracked longitudinally after repeated cold drawing, and the cracking reason for Inconel600 alloy tube was studied from the aspects of microstructure, non-metallic inclusion, cracking morphology, mechanical properties, processing properties, and solution treatment. The results show that the content of nitrogen was high in the Inconel600 alloy tube, and there were a lot of oxides and nitrides formed during smelting process. During cold rolling before cold drawing, the oxide and nitride were chain-like distributing along the rolling direction, and large-sized chain-like inclusions destroyed the uniform continuity of matrix. During repeated drawing process, stresses were concentrated on the inclusions, leading to microcrack initiation here and propagation, and eventually the alloy tube cracked longitudinally.