<正> Unthank等人曾指出,含Cr高的奥氏体不锈钢在600～800℃氮化时,将沿晶界形成大量的CrN,并可能导致沿晶开裂,造成氮化层剥落.Kindlimann和Ansell认为,氮化表面上Fe或Ni-Fe的氮化物增到一定厚度时将产生“白亮层”,冷却时可能剥落。高濑孝夫在讨论氮化温度对18-8钢氮化层脆性影响时指出,低温氮化易出现氮化层剥落。本工作通过氮化前对试样作适当的预先热处理找到了解决氮化层剥落的方法,并探明了氮化层剥落的原因。
The tendency of spalling of nitrided layer of an austenitic heatresistant steel 4Cr14Ni14W2Mo has been studied experimentally. It was found thatthe residual deformation retained in the rolled steel is the root that causes thespalling of nitrided layer of the steel. If the work hardening state is removed by asuitable heat treatment before nitriding, the spalling of nitrided layer can be com-pletely avoided.
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