Abstract The effects of low temperature annealing on the microstructure and mechanical properties of cold rolled 1045 steel were investigated. It was found that the isothermal annealing at 673 K could transform cementite in the rolled steel from lamella to nano-crystalline state. Against the conventional theory, the low temperature annealing treatment could simultaneously enhance the tensile strength and ductility of the cold rolled steel. The underlying mechanisms of enhancing mechanical properties were analyzed, with a focus on the heterogeneous composite structure of a soft fine-grained matrix embedded with hard nano-scale cementite particles.

中文翻译：

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具有异质复合结构的1045钢具有优异的强度和延展性

摘要 研究了低温退火对冷轧1045钢组织和力学性能的影响。研究发现，673 K 的等温退火可以将轧制钢中的渗碳体从薄片状转变为纳米晶态。与传统理论相反，低温退火处理可以同时提高冷轧钢的抗拉强度和延展性。分析了提高机械性能的潜在机制，重点是嵌入硬纳米级渗碳体颗粒的软细晶粒基体的异质复合结构。