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초내열 합금 Inconel 718 열간 헤딩 공정에서의 조직 및 기계적 특성 변화
최홍석(Choi Hong seok),고대철(Ko Dae chul),김병민(Kim Byung min) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Metal forming is the process changing shapes and mechanical properties of the workpiece without initial material reduction through plastic deformation. Above all, because of hot working carried out above recrystallization temperature can be generated large deformation with one blow, it can produce with forging complicated parts or heat resisting super alloy such as Inconel 718 has the worst forgeability. In this paper, we established optimal variation of hot heading process of the Inconel 718 used in heat resisting component and evaluated mechanical properties hot worked product. Die material is SKD61 and initial temperature is 300℃. Initial billet temperature and punch velocity changed, relatively. Friction coefficient is 0.3 as lubricated condition of hot working. CAE is carried out using DEFORM software before making the tryout part, and it is manufactured 150 ton screw press with optimal condition. It is known that forming load was decreased according to decreasing punch velocity.
윤정로,심재익,김택선,이성종,김영배,김학준,이태진,고대철,Yoon, Jung-Ro,Shim, Jae-Ik,Kim, Taek-Seon,Lee, Sung-Jong,Kim, Young-Bae,Kim, Hak-Joon,Lee, Tae-Jin,Ko, Dae-Chul 대한근골격종양학회 2002 대한골관절종양학회지 Vol.8 No.3
말초신경초 내에 발생하는 결절종은 일부 보고된 바는 있으나, 발생빈도는 드문 것으로 되어있으며, 발생 부위는 슬관절과 근위 경비관절 부위의 비골신경에서 가장 흔한 것으로 보고 되어 있다. 저자들은 신경학적 증상없이 슬관절부 비골신경 내에 발생한 결절종에 대하여 후유증 없이 치료하여 이를 보고하고자 한다. Ganglion cysts occurring within sheaths of peripheral nerves have been documented, but are relatively rare entities. The peroneal nerve at the level of the knee and proximal tibiofibular joint is most commonly involved. We report a case of the intraneural ganglion cyst in the peroneal nerve without neurologic deficit, which was excised sucessfully.