Abstract
To the problem of delayed cracking of the high strength low alloy abrasion-resistant steel plate NM360, the fracture, surface cracks and microstructure were investigated by optical microscopy, electron scanning microscopy and energy spectroscopy, and the residual stress was tested by X ray. The main results were as follows: The fracture source was in the center of the thickness of the steel plate and there were obvious central segregation in the mid-depth of the plate. Microstructure was not uniform in the surface, 1/4 depth and mid-depth of the steel, changed form lath martensite to martensite+granular bainite+ferrite. The steel showed the characteristics of the typical stress crack, there were different degree of resiual stree from edge to center, the impact of various residual stresses generating during heat treatment and the flame cutting on the defective areas was the main reason for the formation of the delayed crack.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: DEStech Transactions on Social Science, Education and Human Science
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
