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Display method of original austenite grain
boundary of 18Ni maraging steel |
GU Xiurui,ZHANG Peng,SUN Xiaoran,SUN Jianghua |
Hesteel Group Technology Research Institute, Shijiazhuang 050000, China |
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Guide |
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Abstract The etchants with different composition and concentration were prepared at room temperature. The display method of original austenite grain boundary of 18Ni maraging steel after treatment by chemical etching at different temperatures was studied using optical microscope(Zeiss).The experimental results showed that only the metallographic microstructure of 18Ni maraging steel could be obtained when the etchant with strong corrosivity and high concentration was adopted. However, as 4% (volume fraction) nitric acid alcohol solution was used for chemical etching, the original austenite grain boundaries of the 18Ni maraging steel samples could be clearly observed after solution and air cooling at 800-925 ℃. Moreover, the grain size grades could be evaluated accurately.
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Received: 28 April 2021
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