Tensile deformation and texture evolution in brittle/ductile multilayered steel sheet studied by neutron diffraction

中性子回折法による脆性・塑性複層鋼板の引張変形と集合組織変化挙動に関する研究

徐 平光   ; 小島 真由美*; 鈴木 裕士  ; 南部 将一*; 井上 純哉*; 小貫 祐介*; Harjo, S.   ; 秋田 貢一

Xu, P. G.; Ojima, Mayumi*; Suzuki, Hiroshi; Nambu, Shoichi*; Inoue, Junya*; Onuki, Yusuke*; Harjo, S.; Akita, Koichi

Bulk textures of austenite/nickel/martensite/nickel/austenite multilayered steel and monolithic martensite steel after uniaxial extension were off-line measured using time-of-flight neutron diffraction texture measurement and Rietveld texture analysis techniques. The martensite layer containing {111}112 initial component exhibited certain {111}hkl-fiber orientation splitting characteristics during 510% extension, then such transient splitting texture components reoriented into {111}110 component after 15% extension. The comparison with ferrite texture evolutions in ferrite-austenite multilayered steel and ferrite monolithic steel revealed that above orientation splitting is related to the multiphase interlayer constraint and the phase stress partitioning between martensite and austenite.