Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (7): 956-961.DOI: 10.12068/j.issn.1005-3026.2019.07.009

• Materials & Metallurgy • Previous Articles     Next Articles

Direct Quenching After Rolling and Tempering Processes of Fe-Mn-1.6Ni-C Steel Plate for Hydropower Station

CHEN Jie, LI Chang-sheng, LI Kun, TU Xing-yang   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2018-07-04 Revised:2018-07-04 Online:2019-07-15 Published:2019-07-16
  • Contact: LI Chang-sheng
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Abstract: The microstructure and mechanical properties of Fe-Mn-1.6Ni-C steel plate after direct quenching and tempering were investigated, where the tested steel was processed by controlled rolling, direct quenching and 560~710℃ tempering. The results show that the fine lath-martensite is obtained by direct quenching after rolling and the improved tensile strength of the experimental steel after direct quenching is mainly from solid solution strengthening. After tempering, the tensile strength of the steel decreases and the yield strength increases, which is mainly caused by the carbide precipitation and the pinning effect of the precipitates on the dislocations. Due to the aggregation and growth of carbides and recovery and recrystallization of ferrite, the strength decreases and the impact toughness increases with the increasing temperature of tempering. However, the coarse carbides can be observed in the steel if the temperature of tempering is higher than A○c1, which facilitate the nucleation of micro-cracks and decrease the impact toughness. An optimum tempering temperature of Fe-Mn-1.6Ni-C steel can be obtained, which is 680℃, associated with the yield strength of 963MPa, the tensile strength of 988MPa, the elongation of 20.0%, and the -60 ℃ impact energy of 142J.

Key words: steel plate for hydropower station, Fe-Mn-1.6Ni-C, direct quenching after rolling, tempering temperature, microstructures, mechanical properties

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