Study of Low Tempering Temperature on Microstructure and Properties of Cold-drawn Pearlite Steel Wires
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摘要: 利用扫描电子显微镜、透射电子显微镜、X射线衍射仪,并结合常规力学检测手段,研究了冷拔珠光体钢丝经200~300℃低温回火后组织和性能的变化,探究了冷拔珠光体钢丝在低温回火过程中的强韧化机理。结果表明:冷拔珠光体钢丝的渗碳体片层呈非连续状,且在拉拔和回火过程中均存在纳米渗碳体析出行为。经过低温回火后,冷拔钢丝的强度和延展性均提高,但随着回火温度的提高,其强度小幅度降低,而延展性进一步提高。材料的强度变化主要是由于位错强化效应所致,而延展性提高是由于新析出的纳米渗碳体颗粒可以通过旋转和滑动降低拉伸过程中的应力集中。Abstract: The properties and structure changes of a cold-drawn pearlite steel wire annealed at 200～300 ℃ were studied,and the strengthening and toughening mechanism during tempering was revealed by means of scanning electron microscopy,transmission electron microscopy,X-ray diffraction and conventional mechanical testing methods in this paper.The results show that the pearlite layer of cold drawn steel wire is not continuous,and the precipitation behavior of cementite nanocrystals exists during drawing and tempering.The strength and ductility of cold-drawn steel wire are improved after annealing.With the increasing of annealing temperature,the strength is increased slightly and the ductility is further improved.The change of strength is mainly due to the dislocation strengthening effect,while the improved ductility is due to the fact that the newly precipitated nanocrystalline particles can reduce the stress concentration during tension by rotation and sliding.
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