无间隙原子钢的微观结构特征和塑性应变比

MICROSTRUCTURE AND PLASTIC ORIENTATION STRAIN RATIO OF INTERSTITIAL-FREE STEEL

采用Ｘ射线衍射的ＯＤＦ和ＬＰ分析技术，ＳＥＭ电子通道花样和蚀坑技术观测，研究了超深冲无间隙原子钢板的微观结构特征。结果表明：控制化学成分、保证基体纯净、优选工艺参数，促进强的γ－＜１１１＞／／Ｎ．Ｄ纤维织构的形成是获得优异成型性的关键。用ＣＭＴＰ方法，由ＯＤＦ织构数据从理论计算了塑性应变比（ｒ），表明ｒ＿ｍ值高达３．１８。文中讨论了再结晶织构形成机制。

The microstructure of extra-deep drawirig interstitial-free steel sheet was studied by using ODF of X-ray diffraction,LP analysis technique ,electron chanelling pattern(EPS) technique and etch pits technique. The results show that controlled chemical compositIGns,to keep pure rnatrix,seeking optimal technological pararmeters and forming γ-<lll>∥N.D strong fiber texture are the keys to get best formability.By using CMTP method, plastic strain ratios(r-value)are calculated theoretically from ODF data and show that r_m-value reachs 3.18.In this paper the mechanism to form recrvstallization texture is discussed.