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本文对18—8型奥氏体不锈钢的各种变形条件下的塑性变形试件,电解渗氢试件的内耗进行了实验研究,用X 射线结构分析及薄膜试件透射电子显微镜分析方法,分析了上述试件的位错结构及塑变诱发马氏体相变。主要得到了以下结果:1.此钢冷范性变形后在振动频率500H_z 左右于325°K 所出现的内耗峰是由形变奥氏体引起的,与形变诱发马氏体无关;2.已将上述内耗峰与固溶氢内耗峰,振动频率为1H_z 左右时出现的335°K 内耗峰进行了严格的区别;3.此钢的形变诱发马氏体在振动频率为500H_z 左右时,于360°K 出现另一个内耗峰;4.在一定范性变形条件下出现奥氏体和马氏体两相混合组织时,在325°K 和360°K 范围内(～500H_z)所出现的内耗峰是形变奥氏体内耗峰与形变诱发马氏体内耗峰相叠加而形成的。
In this paper, the internal friction of 18-8-type austenitic stainless steel under various deformation conditions was studied experimentally, and the results of X-ray structural analysis and transmission electron microscopy The dislocation structure and plastic deformation-induced martensitic transformation of the above specimen. The main results are as follows: 1. The internal friction peak of the steel after cold-forging deformation at about 500H_z and 325 ° K is caused by deformed austenite, which has nothing to do with strain-induced martensite. The above-mentioned internal friction peak and solid-solution hydrogen internal friction peak, the vibration frequency of about 1H_z occurs when the internal friction peak of 335 ° K was strictly different; 3. The deformation-induced martensitic steel vibration frequency of about 500H_z at 360 ° K shows another internal friction peak; 4. The internal friction peak appearing in the range of 325 ° K and 360 ° K (~ 500H_z) appears when the two-phase mixed structure of austenite and martensite appears under a certain deformation condition Deformation of austenite within the peak and deformation induced martensite peak overlap formed.