Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Zhang, S.; 森戸 茂一*; 小溝 裕一*
no journal, ,
Development of lath martensite structure in low carbon high alloy steel was in-situ observed using high temperature laser scanning confocal microscopy. The crystallography of the martensite structure was analyzed using electron backscatter diffraction patterns. It was observed that martensite transformation starts from the prior austenite grain boundary. Then, transformation proceeds along the growth direction of martensite block formed initially in the prior austenite grain. Finally, transformation takes place in the neighbors of transformed martensite block.
Hu, W.; 林 好一*; 八方 直久*; 寺井 智之*; 福田 隆*; 掛下 知行*; 高橋 正光
no journal, ,
The gradual changes in the lattice modulation, phonon dispersion and elastic modulus, which are attracting much interest as precursors of the martensitic transition, have been experimentally reported for many materials. However, studying the precursors is difficult because they are immediately followed by the main martensitic transition. Ti
Ni
Fe
, which shows only parent - incommensurate - commensurate phase transition, is a suitable sample for investigating the lattice modulation accompanied by the appearance of the superlattice structure. In the present work, X-ray fluorescence holography technique have been applied for investigating the 3D local structure around Fe and Ni at both the parent and commensurate phases. We will discuss the dynamical structural changes at both phases, and the results will provide hints to the lattice modulation related to precursors of the martensitic transformation.