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采用Gleeble热模拟试验,结合光学显微镜观察、硬度测试及计算分析方法,研究了超高强钢冷轧钢板B1500HS在低冷速(不大于40℃/s)变形下的微观组织和力学性能,并归纳总结了B1500HS钢的显微硬度与晶粒尺寸之间的Hall-Petch关系。结果表明,在热模拟试验中,变形温度的降低、冷却速度的增加或应变速率的增加,都可以细化铁素体晶粒,提高材料力学性能;B1500HS钢的显微硬度HV和晶粒尺寸d之间的Hall-Petch关系可表达为:HV=-290.8+0.987 d-1/2,经验证,对晶粒尺寸在3.3~4.7μm范围的超高强钢B1500HS钢板材,其显微硬度的计算值与测量值偏差较小,Hall-Petch关系具有很好的适用性。
The microstructure and mechanical properties of B1500HS ultra-high strength cold-rolled steel plate under low cooling rate (less than 40 ℃ / s) were studied by Gleeble thermal simulation test combined with optical microscope observation, hardness test and calculation and analysis method The Hall-Petch relationship between microhardness and grain size of B1500HS steel is summarized. The results show that in the thermal simulation test, the decrease of the deformation temperature, the increase of the cooling rate or the increase of the strain rate can refine the ferrite grains and improve the mechanical properties of the material. The microhardness HV and grain size of B1500HS steel The relationship between Hall-Petch can be expressed as: HV = -290.8 + 0.987 d-1/2, verified that the grain size in the range of 3.3 ~ 4.7μm ultra-high strength steel B1500HS steel, the microhardness The deviation of the calculated value from the measured value is small, and the Hall-Petch relation has good applicability.