Effect of heat treatment process on microstructure and properties of 510 MPa grade ship steel

doi:10.13251/j.issn.0254-6051.2021.01.011

Abstract

Abstract: Effects of different heat treatment on the grain size,microstructure,strength and impact absorbed energy of 510 MPa steel were studied by quenching at 870,900,and 930 ℃ and tempering at 620,650 and 680 ℃,respectively.The results show that with the increase of quenching temperature of 870,900 and 930 ℃,the grain size of 510 MPa ship steel becomes 7.5,7 and 6.5 respectively,the strength and the average impact absorbed energy decrease.With the increase of the tempering temperature of 620,650 and 680 ℃,the strength of specimen decreases,and the average impact absorbed energy increases first and then decreases.The 510 MPa grade ship steel has excellent strength and average impact absorbed energy when it is quenched at 900 ℃ for 1.5 h and tempered at 650 ℃ for 2 h.Quenching at 870 ℃ for 1.5 h and tempering at 620 ℃ for 2 h can be selected for higher strength requirements.

Key words: 510 MPa grade ship steel, grain size, microstructure, heat treatment

CLC Number:

TG161

Liu Xuan, Zhao Gang, Li Dahang, Zhou Hongqing, Zhang Youpeng, Zhu Yixuan, Wu Yuxin. Effect of heat treatment process on microstructure and properties of 510 MPa grade ship steel[J]. Heat Treatment of Metals, 2021, 46(1): 61-64.

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