关键词: 声发射；FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>304FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">控氮不锈钢；应力腐蚀开裂；聚类分析；慢应变速率拉伸

Abstract:

The acoustic emission (AE）signals characteristic of nitrogen-added 304NG stainless steel stress corrosion process was studied.Two experiments were performed, one was long term slow strain rate test (SSRT), and the other was short term slow strain rate test.The solution was made of 0.5 mol·L^-1 NaCl and 1.5 mol·L^-1 H₂SO₄.By using combined self-organizing maps and K-means cluster algorithm to classify the AE signals in long term SSRT, in which the duration, counts, energy, amplitude, waveform and frequency band energy were analyzed as the AE signals’ characteristics,and the crack AE signals were found.The classified signals were trained by using the artificial neural network, so as to identify the different types AE signals in short term SSRT.The result showed that AE test for 304NG stainless steel stress corrosion process would be confirmed by electrochemical noise test.And there were mainly three types of AE signals during 304NG stainless steel stress corrosion process, including crack, pitting and bubbles, which could be classified by using cluster analysis and be provided as template to build artificial neural network to identify the AE signals generated in the same corrosion environment.

Key words: 声发射；FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>304FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">控氮不锈钢；应力腐蚀开裂；聚类分析；慢应变速率拉伸