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本文系统地介绍了锻造及固溶化工艺对渗氮层剥落的影响,并探讨了剥落机制。结果表明,过热锻造是引起渗氮层剥落的主要原因。由于过热造成碳化物充分固溶,增大奥氏体内碳及合金元素的过饱和程度。因此在稳定化及渗氮时,碳化物及氮化物沿晶粒界面及孪晶界面连续成网析出,形成渗氮层剥落的断裂源。同时认为,固溶化处理可以消除过热锻造的危害。
This article systematically introduced the forging and solution treatment of nitrided layer spalling, and explored the spalling mechanism. The results show that overheating forging is the main reason for nitrided layer spalling. As a result of overheating carbides full solution, increasing austenite carbon and alloy elements of the degree of supersaturation. Therefore, in the process of stabilization and nitriding, carbides and nitrides are continuously and network-separated along grain boundaries and twin interfaces to form a fracture source of nitrided layer flaking. At the same time that the solution heat treatment can eliminate the dangers of forging.