http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
SDSS (Super Duplex Stainless Steel) 강관의 미세조직 및 부식특성에 미치는 열처리 온도의 영향
이인섭(Insup Lee),천창석(Chang-seok Cheon),임태홍(Tai-Hong Yim),한윤호(Yoon-Ho Han),이면학(Myon-Hag Lee) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6
The aim of this paper is to determine the proper heat treatment temperature for SDSS tube production without σ-phase precipitation. When Mother steel tube was heat treated at 800℃ temperature, relatively a large amount of σ-phase precipitated and grain refinement of ferrite phase occurred simultaneously. However, in Pilgered and Drawn steel tubes, grain refinement of the ferrite phase did not occur and a small amount of σ-phase precipitated. For all three types of steel tubes, the pitting potential was reduced to 2/5 or less compared with the untreated one and corrosion also occurred in the salt spray test due to the precipitation of σ-phase. When heat treatment temperature was 900℃, grain refinement of the ferrite phase occurred and very little σ-phase precipitated in Pilgered and Drawn steel tubes. But when heat treatment was done at 1,000℃ temperature, all three types of steel tubes had a similar corrosion properties of that of untreated one and also corrosion did not occur in the salt spray test, as σ-phase did not precipitate. Therefore, the optimum heat treatment temperature range is determined to be more than 1000℃ for the SDSS at which corrosion does not occur.