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利用SEM、EBSD等分析技术研究了不同退火保温时间对碳化物球化、铁素体回复与再结晶以及实验钢力学性能的影响。结果表明:实验钢热轧后空冷到650℃进行不同保温时间的退火,当保温时间达到30 min时,大多数铁素体发生了再结晶,且铁素体晶粒尺寸最为细小,约为7μm。热轧实验钢的试样屈服强度与抗拉强度均较高,分别为570 MPa和725 MPa,而伸长率为13%。当热轧试样冷却到650℃进行30min的退火,其抗拉强度和屈服强度显著降低,分别下降至460 MPa和635 MPa,而伸长率显著增加,达到21%。
The effects of different annealing holding time on carbide balling, ferrite recovery and recrystallization, and mechanical properties of experimental steel were studied by SEM, EBSD and other analytical techniques. The results show that most of the ferrite recrystallizes when the holding time reaches 30 min, and the grain size of the ferrite is the smallest, about 7 μm . The yield strength and tensile strength of the hot-rolled test steel were higher, 570 MPa and 725 MPa, respectively, while the elongation was 13%. When the hot rolled sample is cooled to 650 ℃ for 30min, its tensile strength and yield strength decrease significantly to 460 MPa and 635 MPa, respectively, while the elongation increases significantly to 21%.