The Crystallographic Textures and Anisotropy in 2507 Super Duplex Stainless Steel

Abstract

In this work, the annealing textures in different thickness layers and the Lankford parameter (r‐value) in 2507 duplex stainless steel (DSS) are studied via tensile testing, X‐ray diffraction (XRD), and electron backscatter diffraction (EBSD). The results show that 2507 DSS has poor formability, especially poor deep drawability and noticeable planar anisotropy after cold‐rolling with an average r‐value of 0.86, a planar anisotropy △r of −0.38, and an earring ratio of 7.43. The orientation distribution functions (ODFs) from the different thickness layers show that the texture mainly exists in the ferrite (α) phase, and there is a significant texture gradient in the thickness direction. The texture of the α phase has a strong α‐fiber texture (<110>//RD) and an undeveloped γ‐fiber recrystallization texture (<111>∥ND). The texture intensity of the austenite (γ) phase is weak and is mainly composed of Copper {112}<111>, Brass {110}<112>, Goss {110}<001>, and S {123} <634>. The {001}<110> texture component is highly intense in the α phase and is the dominant reason for the low Lankford parameter (r‐value), whereas the {112}<110> orientation is the main factor for the high planar anisotropy (Δr). The results of the grain orientations after tensile deformation in different directions show that the maximum volume fraction ratios for the {001} and {111} orientations are the root cause of the largest r‐value in the 45° direction.

Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

“…Diffraction pattern of solid solution mainly shows α (111), α (200), and α (211) diffraction peaks corresponding to ferrite and γ (111), γ (200), γ (220), γ (311), and γ (222) peaks to the austenite phase. [ 19,20 ] Peak intensities of the austenite phase gradually decrease with the deformation level. Furthermore, few peaks, such as γ (311), γ (200), and γ (222), disappeared completely.…”

Influence of Mn content on rolling performance of lean duplex stainless steel

“…Lean duplex stainless steel (LDSS) is a two-phase alloy composed of ferrite and austenite phases, the relatively lower proportion of the two phases is at least 30% meanwhile [1,2]. Compared with the traditional duplex stainless steel, the cost of LDSS is significantly reduced by using nitrogen and manganese instead of nickel and molybdenum.…”

Transformation of the Microstructure of Fe-Cr Steel during Its Production

“…An increased Lankford value is associated with the development of a <111>||ND γ-fibre texture during processing of EN 1.4016. On the other hand, the <110>||RD α-fibre texture has a low r-value and, consequently, poor drawability during deep drawing of this alloy [26][27][28][29].…”