Quasi-in-situ observations of crack propagation and microstructure evolution of high manganese austenitic steel at −196 °C. (1st June 2022)

• Record Type: Journal Article
• Authors: Chen, Jun; Li, Shuang; Ren, Jia-kuan; Liu, Zhen-yu
• Is Part Of: Engineering fracture mechanics. Volume 268(2022)
• Publication Date: 2022-06-01
• Subjects: High manganese austenitic steel -- Quasi-in-situ -- Crack propagation -- Twinning -- Planar slip; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2022.108509
• Languages: English
• ISSNs: 0013-7944

Abstract

Graphical abstract: Highlights: A crack propagation was investigated by quasi-in-situ observations at −196 °C. It was found that the main crack propagates along the {1 1 1} planes. A superior crack propagation resistance was comprehensively clarified. Abstract: The crack propagation behaviors and microstructure characteristics in the high manganese austenitic steel were comprehensively investigated by quasi-in-situ observations at −196 °C. The steel exhibits a superior fracture toughness at −196 °C than at room temperature. It is found that a severe plastic deformation is necessary for a crack initiation. Although the main crack propagates along the {1 1 1} planes due to the plastic strain localization caused by an extensive planar slip, the steel still possesses a superior crack propagation resistance, which is attributed to the activations of multiple twinning and slipping systems, which provide two positive effects on blocking a crack propagation: (1) the plastic deformation further enhanced by multiple twinning and slipping systems as well as (2) a tortuous crack propagation path caused by numerous twin boundaries. Besides, the pronounced deflections at grain boundaries also have a large contribution to block a crack propagation.