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| Analysis and improvement of impact energy of high strength steel |
| SHEN Yanjun |
| Analysis and improvement of impact energy of high strength steel |
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Abstract The average impact energy of 500 MPa grade highstrength steel is 18 J at -20 ℃. For the highstrength steel with unqualified impact energy, the microstructure of the steel plate was inspected by metallographic microscope. It was found that the size of ferrite was nonuniform, the microstructure of surface and core was different. Moreover, there were few pearlites in the core. The analysis showed that the reason to cause nonuniform size of ferrite was the partial recrystallization after the third stand of finish rolling, resulting in the nonuniform size of austenite, which was then inherited to the ferrite. Few pearlites in the core were due to the pearlite transformation from austenite under high coiling temperature and slow cooling speed. By increasing the finishing speed and reducing the coiling temperature, the problem of unqualified impact energy of 500 MPa highstrength steel was solved.
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Received: 15 September 2021
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2022, Vol. 40 
