压力对挤压铸造E级钢低温冲击韧性的影响

doi:10.11896/cldb.19030150

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Abstract The grade E cast steel specimens under different pressures prepared by squeeze-casting were quenched and tempered. The Charpy impact test at low-temperature were carried out and the Brinell hardness were tested. The effect of pressures on the low-temperature impact toughness of grade E cast steel were investigated. The microstructure and impact fracture were observed by optical microscopy (OM) and scanning electron microscopy (SEM). The experimental results show that the low-temperature impact toughness at 40 ℃ of grade E cast steel increases first and then decreases when the pressures are in the range from 0 MPa to 150 MPa. The low-temperature impact energy exhibits their optimal values when the pressure is 38 MPa, which is 65.4% higher than that of metal gravity casting, and the hardness is only reduced by 6.17%. With the further increase of pressure, the Charpy impact energy decreases linearly and the hardness increases slightly. Microstructure analysis shows that with the increase of pressure, the grains of grade E cast steel are refined significantly and the content of ferrite increase. That is beneficial to the impact toughness of grade E cast steel. In addition, because of the increase of degree of super-cooling, the Widmanstatten is precipitated at the pressure of 60 MPa. This leads to the decrease of low-temperature impact toughness. Impact fracture analysis shows that the fracture of grade E cast steel produced by gravity casting in metal mould is quasi-cleavage morphology. The specimens prepared by squeeze-casting at the pressure of 38 MPa still has a large number of fine dimples even at 40 ℃, which belongs to ductile fracture.

Key words： squeeze-casting pressure grade E cast steel low-temperature impact toughness microstructure

Published: 12 March 2020

CLC number:

TG249.2+7

Fund:This work was financially supported by the Scientific and Technological Project of Anhui Province (1604e1002007).

About author:: Tingyue Wangis a graduate student in the Department of Materials Science and Engineering, Beijing Jiaotong University. Her research interes is pressure processing of ferrous metal materials. Two patents for invention have been declared; Shuming Xingreceived his Ph.D. degree in Beijing University of Science and Technology in 1999. He is a professor and doctoral supervisor of School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University. His research interests are technology and theory of metal forming, technology and theory of modern solidification control and research of semi-solid new materials.

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	WANG Tingyue
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Cite this article:

WANG Tingyue,XING Shuming,AO Xiaohui, et al. Effect of Pressure on Low-temperature Impact Toughness of Grade E Cast Steel Prepared by Squeeze-casting[J]. Materials Reports, 2020, 34(6): 6138-6143.

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http://www.mater-rep.com/EN/10.11896/cldb.19030150 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6138

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