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홍문희,한경표,정병수 ( Moon Hee Hong,Kyoung Pyo Han,Byoung Soo Chung ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.4
Clinically adult-onset xanthogranuloma is somewhat different to that of juvenile xanthogranuloma. There seems to be no definitive sites of predilection and concomitant extracutaneous lesions, and spontaneous resolution does not occur in the adult form. The lesions of the adult form are usually asymmetric or solitary. We describe an adult with a solitary xanthogranuloma on the left shoulder. Histological findings of this case show minor differences from juvenile xanthogranuloma but immunohistochemical findings were very similar to those of juvenile xanthogranuloma. (Kor J Dermatol 1997;35(4): 786-789)
관통 시험된 성형장약탄 라이너와 타겟 재료에 있어서의 미세조직 변화
홍문희,이성,노준웅,백운형 한국분말야금학회 2001 한국분말야금학회 학술대회논문집 Vol.2001 No.1
The microstructure of the 1020 mild steel target in the region ahead of craters, made by colliding against Cu and W-Cu shaped-charge jets. has been investigated in the present work. The region ahead of the crater impacted by the Cu shaped-charge jet reveals grain refinement implying the formation of sub-grains, while that of W-Cu one leads to martensitic transformation indicating that the region was heated up to an austenitic region which was followed by rapid cooling. The pressure of W-Cu shaped-charge jet impacting against the target when calculated is higher than that of Cu one. The microhardness of the region ahead of the crater impacted by the W-Cu shaped-charge jet is also higher than that of the Cu one. The microstructure of W-Cu slug that remains inside of the crater depicts the occurrence of the remarkable elongation of W particles during the liner collapse. The microstructural evolution of the region ahead of the crater is discussed on the basis of the pressure dependency of the ferrite/austenite transformation in the steel.
Development of Cu-Bearing Bake-Hardenable Steel Sheets for Automotive Exposed Panels
홍문희,Noi-Ha Cho,김성일,권오준,임성환,문원진 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.6
Recently, newly developed bake-hardenable (BH) steel sheets strengthened by copper sulfide (CuS) have been successfully employed in commercial production lines that supply automotive outer panels. The metallurgical concepts governing fabrication of these new BH steel sheets require keeping carbon content as low as 0.0015wt.% without any additional amount of titanium and/or niobium for solute carbon scavenging. The role of CuS precipitates has turned out to raise the yield strength acting as a barrier against dislocation movement. In this paper, we studied the effects of chemical compositions and manufacturing process variables on the microstructure and mechanical properties of newly developed BH steel sheets. We found that the control of carbon and nitrogen showed a good balance between bake-hardenability (BH) and yield point elongation (YP-El). We identified the crystallographic relationship between the nano-size CuS precipitates and the ferrite matrix of (001)sulfide//(001)α-Fe and [001]sulfide//[001]α-Fe. We also found that the BH and YP-El were affected by the formation of aluminium nitride (AlN) and the annealing temperature.