不同预处理工艺对P20钢两相区淬火组织和性能的影响  

Effects of Different Pretreatment Processes on Microstructure and Properties of P20 Steel in Two Phase Region Quenching

作　　者：李勇[1] 雷文华[1] 李子璇[2] 周毅[1] 

机构地区：[1]西藏大学理学院,西藏拉萨850000 [2]西藏大学医学院,西藏拉萨850000

出　　处：《热加工工艺》2017年第16期225-226,230,共3页Hot Working Technology

摘　　要：采用扫描电镜、光学显微镜、洛氏硬度计、材料拉伸试验机等研究了不同预处理工艺对P20钢两相区淬火组织和性能的影响。结果表明:由于预处理工艺不同,P20钢两相区淬火的显微组织存在明显差异。A组试样(860℃×1h空冷+860℃×30 min炉冷退火)预处理在两相区淬火的铁素体为块状,碳化物颗粒较多;B组试样(860℃×1 h空冷+860℃×30 min油冷淬火)预处理在两相区淬火的铁素体为长条状,碳化物颗粒较少;B组试样两相区淬火的力学性能优于A组试样,其原因是B组试样两相区淬火时,碳化物得以充分固溶扩散,淬火组织中碳化物颗粒少而小。The effects of different pretreatment processes on the microstructure and mechanical properties of two phase region quenching of P20 steel were studied by means of scanning electron microscope, optical microscope, hardness tester,tensile testing machine and so on. The results show that because of different pretreatment processes, there are obvious differences in the microstructure of P20 steel. The ferrite of the A group sample（860℃ ×1 h, air cooling ＋860℃ ×30 min,furnace cooling） pretreatment in the quenching of the two-phase region is block, and there are more carbide particles. Ferrite of B group sample（860℃×1 h, air cooling＋860℃×30 min, oil quenching） pretreatment in the quenching of the two-phase region is long strips, and there are less carbide particles. The mechanical properties of B group sample in two-phase zone quenching is better than those of A group sample. The reason is that when the B group sample is quenched, the carbide can be fully dissolved and diffused, and the carbide particles in the quenching microstructure are few and small.

关 键 词：双相钢 微观组织 力学性能 

分 类 号：TG156.3[金属学及工艺—热处理] TG113[金属学及工艺—金属学]