Application of Transformation Superplasticity for Prevention of Weld Cracking in Cast Iron
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概要
- 論文の詳細を見る
In previous paper, it is shown that electroslag welding has succeeded using our new method with a cored wire and a hollow graphite nozzle. However, it is necessary to more improve the crack resistance of weld metals to apply higher restraint welds, such as a repair welding of large hollow defects in a heavy cast frame of a machine tool. The present paper shows that the application of transformation superplasticity is more effective for prevention of weld cracking due to high thermal restraint. A dilatation test and restraint stress test and determination of CCT curves are conducted on many cast irons with various alloying additions. Above experimental results have revealed that transformation superplasticity is surely applicable in principle for prevention of weld cracking of cast iron. The decrease of contraction stress during transformation is mainly due to abnormal decrease of yield stress and excess ductility by transformation superplasticity, while the effect of transformation expansion is rather small. From restraint weld cracking test study, it is confirmed that weld cracking of cast iron can be avoided even in severe restraint by suitable combination of weld cooling condition and welding materrials selected from a standpoint of transformation superplasticity.
- 社団法人溶接学会の論文
著者
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Kato Noboru
Faculty Of Engineering Tokyo Institute Of Technology
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TAMURA Hiroshi
Faculty of Chemistry, Materials and Bioengineering and HRC, Kansai University
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YOKOI Sadaki
Faculty of Engineering, Tokyo Institute of Technology
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ISHII Yugoro
Faculty of Engineering, Tokyo Institute of Technology
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Tamura Hiroshi
Faculty Of Chemistry Materials And Bioengineering And Hrc Kansai University
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Yokoi Sadaki
Faculty Of Engineering Tokyo Institute Of Technology:(present Address)ishii Ironworks Co. Itd.
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Ishii Yugoro
Faculty Of Engineering Tokyo Institute Of Technology:(present Address)faculty Of Engineering Nippon
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Ishii Yugoro
Faculty Of Engineering Tokyo Institute Of Technology
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Tamura Hiroshi
Faculty Of Engineering Tokyo Institute Of Technology
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