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

作　　者：郭建良 程巨强[1] 麻以林 GUO Jianliang;CHENG Juqiang;MA Yilin(College of Materials Science and chemical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《铸造技术》2021年第6期509-512,共4页Foundry Technology

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,φ53mm棒料920℃保温,水冷200℃回火,R/2处取样的抗拉强度为1654 MPa,A_(kv)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1314 MPa和1379 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。φ53 mm贝氏体钢棒料热处理空冷前进行30s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 φ53 mm bar is heated at 920℃ and cooled at 200℃.The tensile strength of the sample at R/2 is 1654 MPa,and the 4kv 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 1314 MPa and 1379 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.

关 键 词：贝氏体钢 冷却工艺 性能 组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]