基于磁性测定法研究奥氏体不锈钢波纹管的形变马氏体含量

根据形变诱发马氏体磁性的变化，针对SUS304和SUS316L奥氏体不锈钢分步机械胀压成型波纹管以及未经固溶处理与经固溶处理SUS304奥氏体不锈钢液压成型波纹管，采用MP30E—S型铁素体测定仪定量测定了波纹管母材区及焊缝区的形变马氏体含量。结果表明：形变马氏体含量的大小与波纹管材料、相对变形量以及热处理状态等均有很大关系；在相同变形量条件下SUS316L不锈钢的形变马氏体含量比SUS304不锈钢要小得多；相对变形量越大，形变马氏体含量也越大，且波峰处的形变马氏体含量较波谷处的要大得多；与未固溶处理波纹管相比，经固溶处理后波纹管的形变马氏体含量显著减小。

Research on Deformation-induced Martensite Content of Austenite Stainless Steel Bellows Based on Magnetism Testing Method

According to magnetism variety of the deformation-induced martensite,the deformation-induced martensite content was tested with MP30E-S type ferrite measurement instrument,for the bellows made of SUS304 and SUS316L austenite stainless steel separately formed by machine-bulge method,and bellows made of SUS304 austenite stainless steel formed by hydraulic pressure with or without solution treatment respectively.The results show that the deformation-induced martensite content greatly depended on the material,relative deformation amount and heat treatment state.The deformation-induced martensite content of SUS316L stainless steel was much less than that of SUS304 stainless steel under the same deformation condition.The deformation-induced martensite content increased with the increase of relative deformation amount,and the deformation-induced martensite content at the wave crest was much more than that at the wave trough.Solution treatment could greatly reduce the deformation-induced martensite content of the bellows.