Mechanical characterisation of hydrogen-induced quasi-cleavage in a metastable austenitic steel using micro-tensile testing
Mechanical characterisation of hydrogen-induced quasi-cleavage in a metastable austenitic steel using micro-tensile testing
复制标题
DOI：
10.1016/j.scriptamat.2015.11.013
复制
发表时间：
2016-03
影响因子：
6
通讯作者：
Y. Mine;Kaoru Koga;O. Kraft;K. Takashima
中科院分区：
文献类型：
--
作者：
Y. Mine;Kaoru Koga;O. Kraft;K. Takashima
微拉伸试验进行了使用单和孪生双晶体与和不预充氢在亚稳奥氏体钢阐明氢致准解理的发生。充氢试样在屈服后的应力-应变行为中，在平台区应力降低。在此阶段，在母奥氏体内形成马氏体的层状显微组织。断裂以准解理方式沿着马氏体片层的惯习面发生。提出了含氢奥氏体马氏体相变产生的过量氢集中到马氏体板条之间的残余奥氏体中，促进局部变形断裂的机制。
Micro-tensile tests were performed using single- and twinned bi-crystals with and without hydrogen pre-charging in a metastable austenitic steel to elucidate the occurrence of hydrogen-induced quasi-cleavage. The hydrogen-charged specimens exhibited in the stress–strain behaviour a stress decrease in the plateau region after yielding. In this stage, a lamellar microstructure of martensite was formed within the parent austenite. Fracture occurred as quasi-cleavage along the habit planes of the martensite lamellae. A mechanism is proposed where the excess hydrogen generated by the martensitic transformation of hydrogen-containing austenite concentrates into the retained austenite between the martensite laths, promoting the localised deformation to fracture.