研究了一种含Mn、Nb、Ti和B的超低碳洁净钢和两种工业钢X60和XTE355在900℃或780℃压缩70%后在500 ℃等温转变产物的组织与强度.结果表明,在奥氏体非再结晶温区大变形量变形后进行中温转变可有效细化晶粒、提高强度,处理后试验钢的晶粒尺寸为1～2μm,抗拉强度在750MPa以上添加微量硼明显提高钢的贝氏体淬透性,含硼的洁净钢具有细晶粒贝氏体组织、获得了最大的抗拉强度(789MPa).对在Ar3温度附近变形后再经中温等温转变形成的组织、强度以及影响因素进行了讨论
The effects of deformation at 900 ℃ or 780 ℃ on the microstructure and mechanical properties of the products transformed from austenite isothermally have been studied. The samples included: an ultra-low carbon microalloying clean steel containing Mn, Nb, Ti, B, commercial steels X60 and XTE355. The samples were compressed 70% at 900 ℃ or 780 ℃, and followed by isothermal holding at 500 ℃ for 500s or 800s. All of the three steels showed very fine structure and great improvement in their strength. The smallest average grain size is about 1μm, which is obtained in an X60 specimen compressed 70% at 780 ℃ before isothermal holding. But the greatest improvement in strength was shown in the clean steel specimen owing to its large fraction of bainitic ferrite structure.
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