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Direct Heat Treatment of Alloyed Steel Forging

  • 권용남 (한국기계연구원 부설 재료연구소 융합공정연구부) ;
  • 김태옥 (한국기계연구원 부설 재료연구소 융합공정연구부) ;
  • 권용철 (한일단조공업(주) 기술연구소) ;
  • 박동규 (한일단조공업(주) 기술연구소) ;
  • 이상규 (한일단조공업(주) 기술연구소)
  • 발행 : 2008.10.09

초록

In the present study, direct quenching of alloyed steel after hot forging was simulated using commercial finite element program, $FORGE^{TM}$. A typical heat treatment of alloyed steels consists of quenching for hard martensite and subsequent tempering for toughness. In the practice, forgings which cool down to room temperature are heated to temperature of austenite regime. As investigated in the present study, direct quenching of hot forged stock would be beneficial in terms of energy saving. This process has already been propose and termed as ausforging or forged hardening. However, it is well known that quenching temperature would be the most critical factor to control heat treated forging properties. And it is very difficult to control quenching temperature when forged stock gets directly quenched after forging. In this study, we have calculated final forging temperature of stock. Also, quenching simulation was conducted using a series of material parameter which were also calculated using JMATpro, a commercial program for physical properties of materials.

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