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首页> 外文期刊>Journal of Materials Engineering and Performance >Improved Mechanical Properties of a Quenched and Partitioned Medium-Carbon Bainitic Steel by Control of Bainitic Isothermal Transformation
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Improved Mechanical Properties of a Quenched and Partitioned Medium-Carbon Bainitic Steel by Control of Bainitic Isothermal Transformation

机译：通过控制贝氏体等温转化改善淬火和分配的中碳壳体钢的力学性能

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摘要

A triplex microstructure of bainite, martensite and retained austenite in the 0.3C-1.4Si-1.8Mn (wt.%) steel was obtained by the bainitic isothermal transformation combined with Q&P process (B-QP process). The effects of bainite morphology and content on the mechanical properties have been studied by controlling the isothermal holding temperature and time. Results show that with isothermal holding temperature increasing from 320 to 400?°C, the bainite changes from lower bainite to upper bainite and the ultimate tensile strength and toughness decrease. Compared to the Q&T, 360?°C B-QP and 400?°C B-QP processes, the microstructure of the 320?°C B-QP-treated sample consists of lower bainite, martensite and retained austenite, and it exhibits the best combination of strength (1617?MPa), elongation (18.6%), the product of strength and elongation (PSE, 30.1 GPa%) and maximum impact toughness (103?J) when the lower bainite content is about 50%. In addition, the work hardening behaviors indicate that both the 400?°C B-QP sample with upper bainite morphology and the 320?°C B-QP sample containing 75% lower bainite exhibit the higher work hardening rate at the high strain level and larger uniform elongation.
机译：通过贝氏体等温转化与Q＆P工艺联合（B-QP工艺），获得贝氏体，马氏体和保留奥氏体的三重链球菌。通过控制等温控温度和时间来研究贝氏体形态和含量对机械性能的影响。结果表明，随着等温控温度从320增加到400℃，贝氏体从低贝氏体变为上贝氏体，最终拉伸强度和韧性降低。与Q＆T，360°C B-QP和400？°C B-QP工艺相比，320°C B-QP处理的样品的微观结构由下贝氏体，马氏体和保留的奥氏体组成，它展示了强度最佳组合（1617？MPA），伸长率（18.6％），当贝氏体含量下降约50％时，强度和伸长率（PSE，30.1GPa％）和最大冲击韧性（103〜J）。此外，工作硬化行为表明，具有上贝氏体形态的400°C B-QP样品和含有75％低贝氏体的320°C B-QP样品在高应变水平下表现出更高的工作加固率和更大的伸长伸长率。

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