新聞資訊
17%Cr超純鐵素體不銹鋼不同方向拉伸起皺的研究
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-25
采用激光共焦顯微鏡、XRD 和 EBSD 技術, 研究了 17%Cr 超純鐵素體不銹鋼退火板材沿 3 個不同方向拉伸變形后表面起皺與晶粒取向變化之間的關系, 并探索了17%Cr超純鐵素體不銹鋼的拉伸起皺機制.
17%Cr超純鐵素體不銹鋼不同方向拉伸起皺的研究RESEARCH ON RIDGING OF 17%Cr ULTRA PURE FERRITIC ?STAINLESS STEEL AFTER ENLONGATED ALONG VARIOUS DIRECTION
采用激光共焦顯微鏡、XRD 和 EBSD 技術, 研究了 17%Cr 超純鐵素體不銹鋼退火板材沿 3 個不同方向拉伸變形后表面起皺與晶粒取向變化之間的關系, 并探索了17%Cr超純鐵素體不銹鋼的拉伸起皺機制. 結果表明, 17%Cr超純鐵素體不銹鋼退火板材沿著與軋向呈0° (軋制方向, RD), 45°和90° (橫向, TD) 3個不同方向拉伸后, 表面條紋狀起皺方向均與原始軋向平行, 并且隨拉伸角度增大, 表面起皺逐步減輕. 在拉伸過程, 均發生<110>取向向拉伸方向(TA, 拉伸變形方向)轉動. 但沿TD拉伸時未造成晶面轉動, 而沿RD拉伸則轉動形成{112}和{221}面取向. 17%Cr超純鐵素體不銹鋼起皺與<110>//TA取向無關, 而是由沿原RD分布的晶粒簇內的晶面轉動造成的, 并且晶粒簇內的晶向轉動對起皺的影響極小.?
Improved mechanical and chemistry properties of ferritic stainless steel (FSS), such as stamping?formability and corrosion resistance, have been attained by decreasing the content of C and N. Therefore, the ultra?pure ferritic stainless steel with low content of C and N is a good candidate to replace the conventional Cr-Ni?austenitic stainless steel for specific applications to save the higher price of Ni. As compared to conventional?austenitic stainless steel, however, the ferritic stainless steel is susceptible to develop narrow ridges on the sheet?surface during forming operations. The ridges, which can extend over the whole sheet length and have a depth of?20~50 μm, destroy the smooth appearance and surface shine of the product and thereby reduce the quality of the?formed work pieces. This is one of the most serious problems of ferritic stainless steel sheets. Hence, the?improvement for resistance of ridging is desired for further wide applications of ferritic stainless steel. In this?work, laser scanning confocal microscopy, XRD and EBSD were used to observe the corelation between surface?ridging and the evolution of grain orientation of 17%Cr ultra pure ferritic stainless steel after elongated along?three different directions. Furthermore, the mechanism of tensile ridging of ferritic stainless steel was discussed.?The results show that the ridging direction always parallels to the original rolling direction when the 17%Cr ultra?pure ferritic stainless steelis enlongated along 0° (rolling direction, RD), 45° and 90° (transverse direction, TD)?with the rolling directions, respectively. However, the height of ridging gradually decreases with the increase of?the angle betweeen the rolling direction. Meanwhile, tensile texture of <110>//TA (tensile axis) gradually forms?after enlongated along three different directions. The most important phenomenon is that the crystal plane almost?does not rotate when enlongated along TD, while {112} and {221} orientations form when enlongated along RD.?Thus it can be deduced that there is no relationship between ridging and <110>//TA orientation in 17%Cr ultra?pure ferritic stainless steel. Moreover, the rotation of crystal direction in rolling plane has little effect on the?ridging. However, the formation of ridging can be attributed to the rotation of crystal plane in rolling plane with?cluster distribution.
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