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《Materials for Mechanical Engineering》 2015-04
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Influence of Fine-Grain Bands in Forged 690 Alloy Bars on Microstructure of Final Tubes

CAI Zhi-gang;WANG Yong-dong;SU Cheng;CAO Ping;Zhejiang Jiuli Hi-Tech Metals Co.,Ltd.;Shanghai Nuclear Engineering Research & Design Institute;  
Heat treatment experiments were conducted on forged 690 alloy bars for heat-exchange tubes of steam generator in nuclear power plant according to hot extrusion heating process.Annealed intermediate tubes and thermal-treatment final tubes were prepared using product process for heat-exchange tubes.The microstructure of the samples at different states were analyzed.The results show that the non-homogeneous precipitation of carbides was the main reason for abnormal fine-grain bands existing in the microstructure of forged bars.The abnormal finegrain bands in forged bars would have adverse effects on the microstructure uniformity of 690 alloy tubes in succeeding processions and result in non-homogeneous precipitation of carbides in the thermal-treatment final tubes.
【CateGory Index】: TG319
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