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겹치기 마찰교반접합된 Invar 42/SS 400 합금의 미세조직과 기계적 특성 발달
송국현,Song, K.H.,Nakata, Kazuhiro 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
This study was conducted to investigate the microstructure and mechanical properties of friction stir lap joints. Invar 42 and SS 400 were selected as the experimental materials, and friction stir welding was carried out at a tool rotation speed of 200 rpm and welding speed of 100 mm/min. The application of friction stir welding to Invar 42 effectively reduced the grain size in the stir zone; the average grain size of Invar 42 was reduced from $11.5{\mu}m$ in the base material to $6.4{\mu}m$ in the stir zone, which resulted in an improvement in the mechanical properties of the stir zone. The joint interface between Invar 42 and SS 400 showed a relatively sound weld without voids and cracks, and the intermetallic compounds with $L1_2$ type in lap jointed interface were partially formed with size of 100 nm. Moreover, the hook in the advancing side of Invar 42 was formed from SS 400, which contributed to maintenance of the tensile strength. The evolution of microstructures and mechanical properties of friction stir lap jointed Invar 42 and SS 400 are also discussed herein.
포항 . 동해안 지역의 바다회와 관련된 소장폐쇄증의 임상적 고찰
정덕영(D . Y . Chung),송국현(K . H . Song),장중길(J . K . Chang) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.4
N/A A retrospective analysis of 222 patients diagnosed as small bowel obstruction and treated at the department of surgery, Pohang Sunlin Presbyterian Hoapital during the period of 3 years from January 1989 to December 1991 was peformed. Patients in group A (n=112) were associated with previous abdominal surgery. Patients in group B (n =81) were associated with ingestion of a raw saltwater fish and without previous abdominal surgery. Patients in group C (n 17) were not associat ed with either of them. Among them, the group B was thoroughly evaluated. The etiological factor of group B was suspected as intestinal anisakiasis. The results of the study for group B were obtained as follows. The most common age group was fifth decade in 28 cases (34.6%) and the ratio of rnale to female was 1.8: 1. The time interval between ingestion of fresh fish and onset of clinal manifestation was 24 to 48 hours in 33 cases (40.8%). The clinical improvement of symptoms and signs was noted within 12 to 18 hours in 26 cases (32.1%) and 10 to 12 hours in 23 cases (28.3%). The duration of bowel decompreseion with Levin tube was 24 to 48 hours in 30 cases (30.7%) and 48 to 72 hours in 17 cases (20.9%). The neutrophil count was increased in 46 cases (56.8%) in the ranges of from 10.000/mm. The eosinophil count was increased in 19 cases (23.5%). Conservative treatment was done successfully in a11 case of group B.