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通过I&Q&PB热处理工艺对实验钢进行不同淬火温度等温,采用场发扫描电镜(SEM)和X射线衍射仪(XRD)对组织进行观察,并分析实验钢的力学性能。结果表明,不同淬火温度下得到不同的组织和力学性能;淬火温度为380℃时,组织为板条贝氏体,随着淬火温度的升高,组织逐渐向粒状贝氏体转变,且粒状贝氏体存在两种形态,即铁素体基体上存在链状M/A岛和铁素体基体上分布着球状M/A组织;板条状贝氏体抗拉强度高达1 200MPa,但断后伸长率仅为18%,粒状贝氏体强度稍低,抗拉强度为940MPa~800MPa,但塑性较好,伸长率范围27%~30%,其强塑积≥24 000MPa·%,高于板条贝氏体。
The experimental steel was subjected to different quenching temperature isothermal treatment by I & Q & PB heat treatment process. The microstructure was observed by field scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the mechanical properties of the experimental steel were analyzed. The results show that different microstructures and mechanical properties are obtained under different quenching temperatures. When the quenching temperature is 380 ℃, the microstructure is lath bainite. With the increase of quenching temperature, the microstructure changes gradually to granular bainite, The existence of two forms of martensite, ferrite matrix exists on the chain M / A island and ferrite matrix distribution of spherical M / A tissue; lath bainite tensile strength as high as 1 200MPa, but after the break The growth rate is only 18%, the granular bainite is slightly lower, the tensile strength is 940MPa ~ 800MPa, but the plasticity is good, the elongation range is 27% ~ 30%, and its strong plastic product is ≥24000MPa ·% Slab bainite.