热轧窄带65Mn钢珠光体组织与性能的窄范围控制

为制定65Mn窄范围质量控制工艺参数,利用OM、SEM、拉伸试验机及洛氏硬度仪等,研究热轧窄带65Mn钢的终轧温度、终轧后冷速下以及卷取后冷速对珠光体组织及力学性能的影响。结果表明:在其他工艺参数相同的情况下,随着终轧温度的提高、终轧后冷却速率的减缓和卷取后冷却速率的加快,热轧窄带65Mn钢珠光体球团尺寸和片层间距不断增大、片层变厚、抗拉强度及硬度均逐渐降低,当终轧温度大于960℃、终轧后冷却速率小于5.58℃/s及卷取后冷却速率小于0.1℃/s时,其抗拉强度小于900 MPa。

Small Range Control of Pearlite Microstructure and Properties of 65Mn Hot Rolled Narrow Strip

The pearlite microstructure and mechanical properties of 65Mn hot rolled narrow strip was tested by OM、SEM、tensile testing machine and Rockwell hardness tester under different finishing temperature,cooling rate after finish rolling and cooling rate after coiling for formulation of small range quality control process parameters.The results show that with the increase of finishing temperature,the reduction of the cooling rate after finish rolling and increase of the cooling rate after coiling,the pearlite colony and pearlite interlaminar spacing increase,lamellar thicken and tensile strength and hardness gradually decrease.When finishing temperature is greater than 960 ℃,the cooling rate after finish rolling is less than 5.58 ℃/s and the cooling rate after coiling is less than 0.1 ℃/s,the resulting tensile strength is less than 900 MPa.