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材料导报  2020, Vol. 34 Issue (6): 6138-6143    https://doi.org/10.11896/cldb.19030150
  金属与金属基复合材料 |
压力对挤压铸造E级钢低温冲击韧性的影响
王婷玥, 邢书明, 敖晓辉, 王营
北京交通大学机械与电子控制工程学院,北京 100044
Effect of Pressure on Low-temperature Impact Toughness of Grade E Cast Steel Prepared by Squeeze-casting
WANG Tingyue, XING Shuming, AO Xiaohui, WANG Ying
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
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摘要 本工作采用挤压铸造工艺制备了不同压力下的E级钢调质态试样,并进行了低温夏比冲击试验和布氏硬度检测,研究了挤压压力对E级钢低温冲击韧性的影响规律,并用光学显微镜(OM)和扫描电镜(SEM)对显微组织和冲击断口进行了观察。研究结果表明,当挤压压力在0~150MPa范围内,E级钢的40℃低温冲击韧性先增大后减小。在挤压压力为38MPa时,E级钢低温冲击韧性最佳,比金属型重力铸造E级钢提高65.4%,硬度仅降低了6.17%。进一步提高压力,冲击吸收功呈线性下降,硬度小幅上升。显微组织分析表明,随着挤压压力的提高,E级钢晶粒明显细化,铁素体含量增多,有利于E级钢冲击韧性的提高。另一方面,由于过冷度的提高,E级钢在压力为60MPa时析出了魏氏组织,导致低温冲击韧性显著下降。断口分析表明,金属型重力铸造E级钢低温冲击断口为准解理形貌,而采用38MPa挤压铸造的E级钢即使在40℃低温下,断口仍存在大量细密的韧窝,属于韧性断裂。
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王婷玥
邢书明
敖晓辉
王营
关键词:  挤压铸造  压力  E级钢  低温冲击韧性  显微组织    
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
                    发布日期:  2020-03-12
ZTFLH:  TG249.2+7  
基金资助: 安徽省科技攻关计划项目(1604e1002007)
作者简介:  王婷玥,北京交通大学材料科学与工程系硕士研究生。主要研究方向为黑色金属材料压力加工。申报发明专利2项;邢书明,北京交通大学机电学院,教授,博导,半固态成形研究中心主任。1999年7月毕业于北京科技大学材料加工专业,获博士学位。1999年9月至2001年6月在清华大学做博士后研究工作。主要从事机械材料加工工程、金属材料先进成形技术与理论、现代凝固控制技术与理论、半固态新材料研究。拥有发明专利20余项,发表论文近百篇,出版著作3本。
引用本文:    
王婷玥, 邢书明, 敖晓辉, 王营. 压力对挤压铸造E级钢低温冲击韧性的影响[J]. 材料导报, 2020, 34(6): 6138-6143.
WANG Tingyue, XING Shuming, AO Xiaohui, WANG Ying. Effect of Pressure on Low-temperature Impact Toughness of Grade E Cast Steel Prepared by Squeeze-casting. Materials Reports, 2020, 34(6): 6138-6143.
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http://www.mater-rep.com/CN/10.11896/cldb.19030150  或          http://www.mater-rep.com/CN/Y2020/V34/I6/6138
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