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| Discussion about impact toughness and fracture morphology of #br#
nonquenched and tempered steel YG1401 |
| QU Xiaobo 1,WANG Jun 1,BAO Yaozong 2 |
1. Jiangsu Yonggang Group Co., Ltd., Suzhou 215000, China;
2. Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The instrumented impact testing machine was employed to perform series of impact tests of bainite nonquenched and tempered steel YG1401. The macroscopic morphology and microscopic extension morphology of fracture were observed by optical microscopy and scanning electron microscope. Combined with the crack initiation work and crack extension work measured in instrumented impact test, the evolution law of impact fracture morphology of this materials at 24-80 ℃ was investigated. The results showed that the ductilebrittle transition temperature (DBTT) of such material was -12 ℃. During the impact in range of 24-10 ℃, the area of stable crack growth zone (which represented the high toughness of material) was the largest. For the impact at -30 ℃, the area of stable crack growth area decreased sharply. With the further decrease of impact temperature, the area of stable crack growth area still decreased gradually. At impact temperature of 24-10 ℃, the impact fracture morphology was a mixture of coarse tearing edge composed of dense and fine dimples and secondary cleavage with large plastic deformation. With the further decrease of temperature, the radical zone morphology was a mixture of fine tearing edge and primary cleavage.
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Received: 02 September 2020
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2021, Vol. 39 
