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| Cause analysis of layered fracture in tensile test of Q550D steel |
| GUO Feng |
| Shandong Iron and Steel Group Rizhao Co., Ltd., Rizhao 276800, China |
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| Guide |
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Abstract The microstructure analysis of typical layered fracture in tensile test of low alloy high strength steel Q550D was conducted by means of optical microscope(OM) and scanning electron microscopy(SEM). The results showed that the microstructure was composed of bainite, ferrite and granular carbide with certain zonal distribution. In the process of tensile deformation of sample, the dislocation pileup located at large carbide particles led to the origination of microcracks and pores. When the necking down formation occurred on the sample, the crack propagation was caused due to the tensile stress which perpendicular to the tensile axis. The zonal distribution of microstructure further promoted the crack propagation, and the macroscopic layered fracture was finally formed.
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Received: 23 March 2021
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2022, Vol. 40 
