Deformation induced martensitic transformation in metastable steels at room temperature and low temperature monitored by neutron diffraction

中性子回折による室温および低温における準安定鋼の変形誘起マルテンサイト変態の観察

Harjo, S.   ; Mao, W.*; Gong, W.   ; 川崎 卓郎   ; 伊東 達矢   

Harjo, S.; Mao, W.*; Gong, W.; Kawasaki, Takuro; Ito, Tatsuya

Additive manufacturing (AM) has emerged as a prominent topic within metallic materials, encompassing a wide range of applications. During the AM process, materials undergo cyclic heating and cooling, resulting in an inherently heterogeneous microstructure or materials exhibiting distinct microstructural characteristics compared to conventionally manufactured counterparts. For example, maraging steel produced via AM often exhibits a significant presence of retained austenite, while AM-produced stainless steel may demonstrate lower stability of austenite, compared to the conventional manufactured ones. In the presentation, we will provide a brief introduction to the neutron diffraction method, as well as an overview of our in situ studies focusing on the deformation of metastable steels. These studies encompass investigations conducted at both room temperature and low temperature.