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冷却工艺对高强度贝氏体钢组织和性能的影响
Effect of Cooling Process on Microstructure and Properties of High Strength Bainite Steels
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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
College of Materials Science and chemical Engineering, Xi'an Technological University, Xi'an 710021, China
- 关键词:
- 贝氏体钢;冷却工艺;性能;组织;
bainitic steel; cooling process; performance; organization
- 摘要:
- 研究了奥氏体化加热不同冷却工艺贝氏体钢棒料的组织和力学性能。 试验结果表明， 准53 mm 棒料 920 ℃
保温，水冷 200 ℃ 回火， R/2 处取样的抗拉强度为 1 654 MPa ， A KV 为 55.1 J ，具有高强度和较低的韧性，组织为板条回火
马氏体和少量的残余奥氏体。 空冷及水冷 30 s- 空冷 250 ℃ 回火， R/2 处取样的强度分别为 1 314 MPa 和 1 379 MPa ，冲
击值 A KV 分别为 74.0 J 和 71.7 J ，两者冷却方式具有较高的强度和高的冲击值，组织为贝氏体铁素体和奥氏体组
织。 准53 mm 贝氏体钢棒料热处理空冷前进行 30 s 水冷的冷却工艺，可以细化棒料的组织，提高棒料的强度和冲击值。
The microstructure and mechanical properties of bainitic steel bars with different austenitizing heating and
cooling processes were studied. The results show that 准53 mm bar is heated at 920 ℃ and cooled at 200 ℃. The tensile
strength of the sample at R/2 is 1 654 MPa, and the A KV is 55.1 J. The microstructure is lat tempered martensite and a small
amount of residual austenite. The strength of the samples sampled at R/2 is 1 314 MPa and 1 379 MPa, and the impact
value A KV is 74.0 J and 71.7 J, respectively. The two cooling methods have high strength and impact value, and the
microstructure is bainitic ferrite and austenite. The cooling process of water cooling for 30 s before air cooling of 53 mm in
diameter bainite steel bars during heat treatment can refine the structure of bars and improve the strength and impact value
of bars.