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Ti-Nb 복합 첨가강의 BH특성에 미치는 균열온도의 영향

Title
Ti-Nb 복합 첨가강의 BH특성에 미치는 균열온도의 영향
Other Titles
Effect of Soaking Temperature on the Bake Hardnability of Ti-Nb Stabilized Steel Sheets
Author
남태운
Keywords
bake hardenability; aging index; NbC; soaking temperature; 금속공학
Issue Date
2004-08
Publisher
한국주조공학회
Citation
한국주조공학회지, v. 24, No. 4, Page. 231-237
Abstract
Bake hardenable steel utilizes the phenomenon of strain aging to provide an increase in the yield strength of formed components. An increase of the carbon content will improve the bake hardening response: more solutes are available to pin mobile dislocations and to form the clusters more rapidly. But aging resistance decrease as increasing solute carbon. In order to under-stand the compatibility between bake hardenability and aging resistance. The optimum solute carbon control methods during manufacture should be determined. In this paper, the effect of continuous heat cycle conditions such as soaking temperature, rapid cooling start temperature, cooling rate on BH(Bake Hardenability), AI(Aging Index), YP-EI(Yield Point Elongation) and other mechanical properties have been investigated. and following results were obtained. In the case of soaking temperature, BH increases with higher soaking temperature because of NbC dissolution(830℃), Therefore the solute carbon and BH at 850℃ and 870℃ are higher than these at 810℃. But BH at 870℃ is a little lower than that at 850℃ owing to the ferrite grain size. The measurement of amount of dissolution C using IFT(Internal Friction Test) can explain the relation of solute carbon and BH.
URI
https://www.koreascience.or.kr/article/JAKO200423158718748.pagehttps://repository.hanyang.ac.kr/handle/20.500.11754/151689
ISSN
1598-706X; 2288-8381
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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