摘要:
采用OM、SEM、拉伸试验等方法,对不同Ti含量低碳微合金钢的显微组织与力学性能进行测试与表征,并探讨了其强化机制。结果表明,随着有效Ti含量的升高,试验钢的强度提高,延伸率下降,屈强比升高。当Ti含量由0.016%提高到0.137%时,试验钢的屈服强度由327 MPa提高到710 MPa,增加383 MPa,抗拉强度由418 MPa提高到773 MPa,增加355 MPa。当有效Ti含量在0~0.052%和0.052%~0.107%区间时,0.01%的有效Ti含量增量对屈服强度的贡献分别约为44 MPa和21 MPa。
Abstract:
Microstructure and strengthening mechanism of low carbon micro-alloyed steel with different contents of titanium were characterized by OM and SEM analysis and tensile and impact testing.With the increase of titanium content,the strength and yield ratio of the tested steel increased,while the elongation decreased.When the titanium content increased from 0.016% to 0.137%,the yield strength increased from 327 to 710 MPa,increasing by 383 MPa,while the tensile strength increased from 418 to 773 MPa,increasing by 355 MPa.When the effective titanium content in the ranges of 0 ～ 0.052% and 0.052% ～ 0.107%,the increments of yield strength for each 0.01% of effective titanium content are roughly 44 MPa and 21 MPa,respectively.
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