Evolution of dislocation structure determined by neutron diffraction line profile analysis during tensile deformation in quenched and tempered martensitic steels

中性子ラインプロファイル解析によるマルテンサイト鋼の引張変形中の転位構造変化の決定

段野下 宙志*; 長谷川 寛*; 樋口 翔*; 松田 広志*; Gong, W.   ; 川崎 卓郎   ; Harjo, S.   ; 梅澤 修*

Dannoshita, Hiroyuki*; Hasegawa, Hiroshi*; Higuchi, Sho*; Matsuda, Hiroshi*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Umezawa, Osamu*

The role of the dislocation structure on the work-hardening behavior during the tensile deformation of quenched and tempered martensite was studied. The evolution of the dislocation structure during tensile deformation at room temperature in ultralow-carbon 18 mass%Ni martensitic steels under the conditions of as-quenched by subzero-treatment (SZ) and quenched-and-tempered at 573 and 773 K (T573 and T773, respectively) was monitored using in situ time-of-flight neutron diffraction combined with the convolutional multiple whole profile (CMWP) procedure. The changes in the dislocation parameters due to tempering and deformation obtained by the CMWP procedure were explained by the metallurgical phenomena of body-centered cubic iron.