Characterization of the structural details of residual austenite in the weld metal of a 9Cr1MoNbV welded rotor
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第6期
论文作者：Xia Liu Hui-jun Ji Peng Liu Peng Wang Feng-gui Lu Yu-lai Gao
文章页码：563 - 568
摘 要：The existence of residual austenite in weld metal plays an important role in determining the properties and dimensional accuracy of welded rotors. An effective corrosive agent and the metallographic etching process were developed to clearly reveal the characteristics of residual austenite in the weld metal of a 9Cr1 MoNbV welded rotor. Moreover, the details of the distribution, shape, length, length-to-width ratio, and the content of residual austenite were systematically characterized using the Image-Pro Plus image analysis software. The results revealed that the area fraction of residual austenite was approximately 6.3% in the observed weld seam; the average area, length, and length-to-width ratio of dispersed residual austenite were quantitatively evaluated to be（5.5 ± 0.1） μm2,（5.0 ± 0.1） μm, and（2.2 ± 0.1）, respectively. The newly developed corrosive agent and etching method offer an appropriate approach to characterize residual austenite in the weld metal of welded rotors in detail.
Xia Liu1,2，Hui-jun Ji3，Peng Liu3，Peng Wang2，Feng-gui Lu4，Yu-lai Gao3
1. Department of Mechanical Engineering, Tsinghua University2. Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd.3. School of Materials Science and Engineering, Shanghai University4. School of Materials Science and Engineering, Shanghai Jiao Tong University
摘 要：The existence of residual austenite in weld metal plays an important role in determining the properties and dimensional accuracy of welded rotors. An effective corrosive agent and the metallographic etching process were developed to clearly reveal the characteristics of residual austenite in the weld metal of a 9Cr1 MoNbV welded rotor. Moreover, the details of the distribution, shape, length, length-to-width ratio, and the content of residual austenite were systematically characterized using the Image-Pro Plus image analysis software. The results revealed that the area fraction of residual austenite was approximately 6.3% in the observed weld seam; the average area, length, and length-to-width ratio of dispersed residual austenite were quantitatively evaluated to be（5.5 ± 0.1） μm2,（5.0 ± 0.1） μm, and（2.2 ± 0.1）, respectively. The newly developed corrosive agent and etching method offer an appropriate approach to characterize residual austenite in the weld metal of welded rotors in detail.
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