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运用光学(OM)、扫描(SEM)和透射(TEM)电镜等方法,研究了不同时效温度下高强度含Cu钢的力学性能,并对微观组织结构进行了系统分析。结果表明,时效温度为640℃时,钢的强度超过785 MPa,该钢可以获得良好的低温韧性和塑性匹配。分析得出ε-Cu的析出强化、板条结构的回火马氏体组织及“有效晶粒尺寸”的细化,是试验钢获得优良综合性能的主要原因。
The mechanical properties of high strength Cu-containing steel under different aging temperatures were studied by means of optical (OM), scanning (SEM) and transmission electron microscopy (TEM). The microstructure of the steel was systematically analyzed. The results show that when the aging temperature is 640 ℃, the strength of steel exceeds 785 MPa, the steel can obtain good low temperature toughness and plastic matching. It is concluded that the precipitation hardening of ε-Cu, the tempered martensite structure of slab structure and the refinement of “effective grain size” are the main reasons for the excellent comprehensive properties of test steel.