Influence of hot rolling on the microstructure of lean duplex stainless steel 2101  

作　　者：Zhi-jun Gao Jing-yuan Li Zhi-hui Feng Yi-de Wang 

机构地区：[1]School of material science and engineering,University of Science and Technology Beijing,Beijing,100083,China [2]Institute of Engineering Technology,University of Science and Technology Beijing,Beijing,100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2019年第10期1266-1273,共8页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. U1806220 and U1660114)

摘　　要：In this work, the microstructure and the strain partitioning of lean duplex stainless steel 2101 (LDX 2101) during different hot-rolling processes are investigated by optical microscopy and electron-backscattered diffraction (EBSD). The results show that the LDX 2101 exhibits poor thermoplasticity at high temperature. The four-pass hot-rolled plates show fewer edge-cracking defects and superior thermoplasticity compared with the two-pass hot-rolled plates prepared at different temperature. The phase boundary is the weakest site in the LDX 2101. The cracks are initiated and propagated along the phase boundaries during the hot-rolling process. According to the EBSD analysis, the increase of the hot-rolling pass can dramatically improve the strain distribution in ferrite and austenite phases and promote the strain transmission in the constituent phases, thereby improving the coordinated deformation ability of the two phases. This effect further in- creases the thermoplasticity and reduces the formation of edge cracks in LDX 2101.In this work, the microstructure and the strain partitioning of lean duplex stainless steel 2101(LDX 2101) during different hot-rolling processes are investigated by optical microscopy and electron-backscattered diffraction(EBSD). The results show that the LDX 2101 exhibits poor thermoplasticity at high temperature. The four-pass hot-rolled plates show fewer edge-cracking defects and superior thermoplasticity compared with the two-pass hot-rolled plates prepared at different temperature. The phase boundary is the weakest site in the LDX 2101. The cracks are initiated and propagated along the phase boundaries during the hot-rolling process. According to the EBSD analysis, the increase of the hot-rolling pass can dramatically improve the strain distribution in ferrite and austenite phases and promote the strain transmission in the constituent phases, thereby improving the coordinated deformation ability of the two phases. This effect further increases the thermoplasticity and reduces the formation of edge cracks in LDX 2101.

关 键 词：LEAN duplex STAINLESS steel HOT-ROLLING process THERMOPLASTICITY strain distribution 

分 类 号：TG1[金属学及工艺—金属学]