研究了HSLAl00钢在两相区二次淬火时淬火温度对组织和屈强比的影响。结果表明：HSLA100钢在两相区二次淬火后形成了铁素体和M／A岛的混合组织；700℃淬火时，沿板条状铁素体分布着少量岛状组织；随淬火温度的升高，岛状组织数量增多且粗化，同时铁素体形貌从单一的板条状逐渐向多边形状转变，且其中的位错密度降低；当淬火温度升到820℃时，其显微组织又恢复到板条贝氏体；试验钢的屈强比在700740℃温度范围内从0．94持续下降至0．67，而在740~780℃区间内波动很小（约为0．67），当温度超过780℃后又大幅上升。
Effects of secondary quenching temperature on microstructure and yield ratio of HSLA (high strength low alloy) 100 steel in the two-phase region were investigated. The results show that the mixed microstructure of ferrite and the M-A (martensite-austenite) islands were obtained in the two-phase region after secondary quenching. A small amount of island structure distributing along the lath ferrite was observed when quenching temperature was 700 ℃. With the increase of quenching temperature the island structure increased in the number and coarsened in the shape, and the ferrite morphology gradually changed from a single lath to the multilateral shape with the decrease of the dislocation density. When quenching temperature was 820 ℃, the microstrueture reverted to lath bainite. The yield ratio of the test steel continually declined from 0. 94 to 0. 67 in the range of quenching temperature from 700 ℃ to 740 ℃, but kept a very small fluctuation in the range of 740-780 ℃(about O. 67), and finally raised sharply at quenching temperatures above 780 ℃.
参考文献
| [1] | 严翔,周桂峰,陈玮,刘武群.两相区加热温度对HSLA100钢组织演变的影响[J].热加工工艺,2011(22):60-62,66. |
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