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| Delayed Fracture Behavior Of Ultrafine Grained High Strength Steel |
| HUI Weijun; DONG Han; WENG Yuqing; SHI Jie; NIE Yihong;CHU Zuoming; CHEN Yunbo |
| Institute of Structural Materials; Central Iron & Steel Research Institute; Beijing 100081 |
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Cite this article:
HUI Weijun; DONG Han; WENG Yuqing; SHI Jie; NIE Yihong; CHU Zuoming; CHEN Yunbo. Delayed Fracture Behavior Of Ultrafine Grained High Strength Steel. Acta Metall Sin, 2004, 40(6): 561-.
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Abstract 42CrMoVNb steel with ultrafine prior austenite grain, its size as fine as 2 m, was obtained through rapidly cycle heat treatment. The effect of ultrafine grain size on delayed fracture behavior is studied using sustained load tensile test with notched specimen. It is shown that both strength and delayed fracture resistance of 42CrMoVNb steel increase when its grain size is refined from 20 m to 4 m, but they do not increase when refined to 2 m. When the steel was
tempered at high temperature, its fracture characteristic at crack initiation area changes from intergranular to transgranular when its grain size is refined from 20 m to 8---4 m, while the fracture characteristic is intergranular when its grain size is refined to 2 m. Its fracture characteristics are all intergranular fracture for all the grain sizes investigated when tempered at low temperature. The reason for this kind of delayed fracture behavior is discussed mainly from the stress concentration and segregation at grain boundary.
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Received: 10 July 2003
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