摘要
对不同硅含量的低碳贝氏体钢进行轧制,对轧制后的试样进行组织检验和拉伸试验,分析了该钢的显微组织和力学性能。结果表明:Si含量从1.0 wt%增加到1.5 wt%时,试样的微观组织基本相同,均为粒状贝氏体+M/A岛,其屈服强度、抗拉强度略有增加,伸长率基本相同,强度的增加主要来源于Si的固溶强化作用。Si含量从1.5wt%增加到2.0wt%时,该钢的显微组织明显变化,含硅2.0 wt%钢的显微组织为粒状贝氏体+板条马氏体+等轴铁素体,该钢的屈服强度及抗拉强度显著增加,但相比于含Si量1.5wt%的钢,伸长率、强塑积均下降,强度的提高主要是固溶强化、相变强化等的综合作用。比较三种低碳贝氏体钢,若只考虑钢的强度因素,则Si的添加量应达2.0 wt%;若只考虑钢种塑性及强塑积,则Si的添加量应为1.5 wt%。
The rolling experiments of three low carbon bainite steels with different silicon contents were performed,and then the microstructure and tensile test was carried out. The microstructure and mechanical properties of the steels were analysed. The results show that when Si content increases from 1.0 wt% to 1.5 wt%, the microstructure of the sample is basically same, which is granular bainite＋M/A island. The yield strength and tensile strength increase slightly, but the elongation is basically same. When Si content increases from 1.5 wt% to 2.0 wt%, the microstructure of the sample changes significantly~ the samples with 2.0 wt% Si consist of granular bainite, lath martensite and axial ferrite. The yield strength and tensile strength of tile above sample increase significantly, compared with the sample with 1.5wt%Si, the elongation and the product of strength and elongation decrease. The improved strength mainly results from the combined effects of solid solution hardening and transformation hardening. Compared with three kinds of low carbon bainite steels, it can be obtained that if only considering the strength, the addition of Si content should be about 2.0 wt%. If only considering the elongation and the product of strength and elongation, the amount of Si content should be about 1.5 wt%.
出处
《热加工工艺》
CSCD
北大核心
2016年第22期85-87,91,共4页
Hot Working Technology
基金
国家自然科学基金项目(51274154)
关键词
硅
粒状贝氏体
M/A岛
显微组织
力学性能
Si
granular bainite
M/A island
microstructure
mechanical properties
