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水-空冷热处理贝氏体钢液冷时间对其组织性能的影响
Effect of Water Cooling Time on Microstructure and Properties of Water-air Cooled Bainitic Steel
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- DOI:
- 作者:
- 郭建良，程巨强，麻以林
GUO Jianliang, CHENG Juqiang, MA Yilin
- 作者单位:
- 西安工业大学 材料与化工学院，陕西 西安 710021
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China
- 关键词:
- 贝氏体钢；水-空冷却；组织；性能
bainite steel; cooling rate; microsteucture; mechnical property
- 摘要:
- 研究了准53 mm贝氏体钢棒料 920 ℃奥氏体化后水-空冷冷却条件下， 水冷时间对组织和力学性能的影
响。 结果表明，水冷 20 s 后空冷，力学性能最佳，边部 Rm 为 1 363 MPa，AKV 为 76.5 J；1/2 半径处 Rm 为 1 361 MPa，AKV 为
80.6 J；心部 AKV 为 97.5 J。与空冷贝氏体钢相比，20 s 水冷-空冷，边部和 1/2 半径处拉伸强度和冲击性能提升幅度不大，
但可以大幅度提高棒料心部的冲击值。 20 s 水冷-空冷，组织为贝氏体+铁素体+残余奥氏体；50 s 以上水冷-空冷，组织
为回火马氏体、贝氏体和少量的残余奥氏体。
The effect of water cooling time on the microstructure and mechanical properties of diameter with 53 mm bainitic steel bars after austenitizing at 920 ℃ was studied. The results show that the best mechanical properties are obtained by air cooling after water cooling for 20 s, with edge Rm of 1 363 MPa and AKV of 76.5 J. Rm and AKV at 1/2 radius are 1 361 MPa and 80.6 J respectively, the AKV at center is 97.5 J. Compared with the air-cooled bainite steel, the tensile strength and impact property at the edge and 1/2 radius of the 20 s water-cooled bainite steel are not greatly improved, but the impact value at the core of the bar can be greatly increased. For 20 s, the structure is bainite +ferrite+ retained austenite; Over 50 s, the microstructure is tempered martensite, bainite and a small amount of residual austenite.