Defect Recovery and Control in Heavy Forgings by Two Times Upsetting and Stretching Process

Juan Hua Su; Yan Wei Chen; Yun Yun Chen; Yu Lin Shi

doi:10.4028/www.scientific.net/AMR.291-294.706

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 291-294Defect Recovery and Control in Heavy Forgings by...

Defect Recovery and Control in Heavy Forgings by Two Times Upsetting and Stretching Process

Abstract:

In practical production, the heavy forgings of the largest diameter 1225 mm larger than its length 905 mm are unqualified for supersonic inspection. By means of acid-eroding, scanning electron microscopy and energy spectrum analysis on defects, it is shown that the defects are originated from inclusions made up of Al₂O₃, Fe₂O₃ and a little CaO. In order to improve forging quality, the controlling mechanism of defects is analyzed, and forging process of two times upsetting and stretching process is researched to eliminate the cracks originated from inclusions. The result shows that the inclusions in forgings can be controlled and the inner cracks recovered effectively by two times upsetting and stretching process. All of the forgings meet the supersonic standard which indicates that this process is better fit for heavy forgings with largest diameter larger than its length.

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Materials Processing Technology, AEMT2011

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Periodical:

Advanced Materials Research (Volumes 291-294)

Pages:

706-709

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.291-294.706

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Online since:

July 2011

Authors:

Juan Hua Su, Yan Wei Chen, Yun Yun Chen, Yu Lin Shi

Keywords:

Defect Control, Defect Recovery, Heavy Forgings, Inclusion Cracks, Two Times Upsetting and Stretching Process

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