DONG jianxin XIE Xishan ZHANG Shouhua University of Science and Technology Beijing
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Beijing
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China doctorate student
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Department of Materials Science and Engineering
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University of Science and Technology Beijing
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Beijing 100083
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China
金属学报(英文版)
The precipitation behavior in Inconel 718 and modified alloys has been studied by means of TEM.The structure of associated precipitation and compact morphology of γ″+γ′ were ob- tained by modifying the contents of Al,Ti and Nb.Experimental results show that the com- pact morphology of γ″+γ′ has the best structure stability at higher temperatures.Instead of the transformation γ″→δ in alloy 718 the dissolution of strengthening phases in modified alloy leads material degradation.
关键词:
superalloy
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NI Yushan CHENG Guangxu KUANG Zhenbang Xi'an Jiaotong University
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China doctorate student
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Institute of Engineering Mechanics
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Xi'an Jiaotong University
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Xi'an 710049
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China
金属学报(英文版)
Hausdorff dimension of fracture surface roughness of welded joint,both welding metal and heat-affected zone.of pressure vessel steel 16MnR,tested under strain-controlled low-cycle fatigue,was examined with computer vision srstem and by two-dimensional variation method. Results show that it decreases with the increase of cyclic hysteresis energy.The Hausdorff di- mension variation at heat-affected zone is greater than that of weld metal.It is believed that the greater the fractal dimension is,the longer the fatigue life will be.
关键词:
welded joint
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