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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 pretreatments on the microstructure and properties of two-phase zone of P20 steel were studied by scanning electron microscope, optical microscope, Rockwell hardness tester and tensile tester. The results show that due to the different pretreatment process, the microstructure of P20 steel quenched in two-phase zone is obviously different. A group of samples (860 ℃ × 1h air cooling + 860 ℃ × 30 min furnace cooling annealing) pretreatment in the two-phase zone quenched ferrite bulk, more carbide particles; B group samples (860 ℃ × 1 h air cooling + 860 ℃ × 30 min oil quenching) pretreated in the two-phase quenched ferrite strip is long, less carbide particles; B group two-phase quenching of the specimen is better than the mechanical properties of the A group The reason is that when the two-phase zone of Group B sample is quenched, the carbides are fully dissolved and diffused, and the carbide particles in the quenched structure are small and small.