It has been studied that the aluminum extrusion with the ingot-recycled composite billet that is casted. The billet is composed of the inner rod with the recycled and the outer ring with the ingot aluminum. For easy producing the tensile specimens to evaluate the bonding strength between recycled and ingot material, the extrusion die was designed. Two types of the billet are extruded. One is a composite billet that is casted. The other is an assembled billet with the turned bars. The strength is measured from tensile tests with extruded specimens. The effect on the strength of the oxidized layer between the materials has been researched with EDS analysis.

Saw wires have been widely used in industries to slice silicon (Si) ingots into thin wafers for semiconductor fabrication. This study investigated the microstructural and mechanical properties, such as abrasive wear and tensile properties, of a saw wire sample of 0.84 wt.% carbon steel with a 120 μM diameter. The samples were subjected to heat treatment at different linear velocities of the wire during the patenting process and two different wear tests were performed, 2-body abrasive wear (grinding) and 3-body abrasive wear (rolling wear) tests. With an increasing linear velocity of the wire, the tensile strength and microhardness of the samples increased, whereas the interlamellar spacing in a pearlite structure decreased. The wear properties from the grinding and rolling wear tests exhibited an opposite tendency. The weight loss resulting from grinding was mainly affected by the tensile strength and microhardness, while the diameter loss obtained from rolling wear was affected by elongation or ductility of the samples. This result demonstrates that the wear mechanism in the 3-body wear test is much different from that for the 2-body abrasive wear test. The ultra-high tensile strength of the saw wire produced by the drawing process was attributed to the pearlite microstructure with very small interlamellar spacing as well as the high density of dislocation.

사용후핵연료 파이로프로세싱 공정 생성물인 우라늄 전착물을 잉곳 형태로 주조하는 공정이 있다. 이 논 문에서는 실험실 규모의 우라늄 전착물 잉곳 주조 장치에 대한 설계 개념을 소개하고, 이에 따라 제작된 장 치의 성능 시험 결과 및 우라늄을 사용한 잉곳 주조 시험 결과를 소개한다. 이 장치는 도가니를 경동시켜 우라늄 용탕을 주형에 주입하여 우라늄 잉곳을 제조하며, 우라늄 전착물을 연속으로 주입할 수 있는 컵 형태의 원료 장입장치를 장착하였다. 이러한 장치를 사용하면 우라늄 전착물의 잉곳 생산성을 높일 수 있다. 실험 결과 우라늄 원료를 장입하여 주조한 결과 수축공이 적은 양호한 주물을 제조하는데 성공하였으며, 이러한 실험실 규모의 장치를 개발한 경험을 활용하여 공학규모의 장치를 설계하 는데 활용하였다.

  In this research article, scheduling a casting sequence in a job-shop type foundry involving a variety of casts made of an identical alloy but with different shapes and weights, has been investigated. The objective is to produce the assigned mixed order