Combination of High Yield Strength and Improved Ductility of 21Cr Lean Duplex Stainless Steel by Tailoring Cold Deformation and Low-Temperature Short-Term Aging
作者机构：Key Laboratory of Advanced Structural MaterialsMinistry of EducationChangchun University of TechnologyChangchun130012China School of Materials Science and EngineeringChangchun University of TechnologyChangchun130012China Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail TransitChangchun University of TechnologyChangchun130012China
出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)
年 卷 期：2024年第37卷第4期
页 面：695-702页
核心收录：
学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
基 金：supported by the Jilin Scientific and Technological Development Program(No.YDZJ202201ZYTS669) the National Natural Science Foundation of China(Nos.51974032,52174355,51874043 and 51604034).
主 题：Lean duplex stainless steel Cold rolling Aging Microstructure Mechanical properties Use our pre-submission checklist
摘 要：Proper matching of cold-rolled deformation and low-temperature short-term aging can simultaneously enhance the strength and ductility of the lean duplex stainless steel. To investigate this, the microstructure evolution of cold-rolled and aging steels was observed by using scanning electron microscopy, transmission electron microscopy and electron backscattered diffraction. Additionally, the phase volume fraction was measured using X-ray diffraction. In this study, it was observed that the elongation of 21Cr lean duplex stainless steel significantly increased to 16.7% after undergoing moderate cold deformation (~ 40% reduction) and subsequent aging treatment at 550 ℃ for 30 min. Remarkably, the material still maintained a high yield strength of 1045 MPa. Such an excellent mechanical property was attributed to a unique microstructure combination of fine α -martensite, twins, coarsened austenite resulting from partial martensite reverse transformation, and two-phase fine layered structure. The result of this study may open up new horizons for the alloy development in order to overcome the low ductility of cold-rolled high-strength lean duplex stainless steel.
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