Microstructure evaluation of multilayered steel after tensile deformation

引張変形後の複層鋼板組織評価研究

徐 平光   ; 秋田 貢一; 鈴木 裕士  ; 小島 真由美*; 南部 将一*; 井上 純哉*; 小関 敏彦*

Xu, P. G.; Akita, Koichi; Suzuki, Hiroshi; Ojima, Mayumi*; Nambu, Shoichi*; Inoue, Junya*; Koseki, Toshihiko*

As-quenched martensite is of low ductility and generally not suitable for direct usage as an important sheet structural material. By using the sandwich-type structure, the multilayered steel composite was reported to possess good strength-ductility balance. In order to evaluate the plastic deformation characteristics of martensite, the angle dispersive neutron diffraction technique was here employed to investigate the residual strain and texture evolution after uniaxial tensile deformation of SUS301/420J2 multilayered steel composite. It is found that the evident plastic deformation occurred in martensite. The tensile residual strain occurred in martensite both along tensile and transverse directions of multilayered steel composite. The change in integrated intensity shows that the martensite ductility improvement is partially related to the enhancement of work-hardening ability of martensite through the deformation induced martensite transformation from austenite.