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首页> 外文期刊>Journal of Materials Engineering and Performance >Correlation Between Structure and Properties of Low-Carbon Cu-Ni-Mo-Ti-Nb Ultrahigh-Strength Steel
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Correlation Between Structure and Properties of Low-Carbon Cu-Ni-Mo-Ti-Nb Ultrahigh-Strength Steel

机译：低碳Cu-Ni-Mo-Ti-Nb超高强度钢结构与性能的相关性

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摘要

Low-carbon Cu-Ni-Mo-Ti-Nb steel having more than 1700MPa tensile strength and good low-temperature impact toughness was successfully designed and processed for automobile, defence and structural applications. The steel was thermomechanical controlled processed at a different finish rolling temperatures (750-850 degrees C) and cooled at two different conditions: air cooling and water quenching. Evolutions of microstructure and precipitates were thoroughly characterised to understand the effect of different factors, such as steel composition, finish rolling temperature and cooling rate on the mechanical properties. The results indicate that the steel processed at 750 degrees C finish rolling temperature (FRT) followed by water quenching has exhibited superior tensile properties with a yield strength of 1034-1449MPa, the tensile strength of 1598-1726MPa and total elongation of 10-13%. Such an ultrahigh-strength level is primarily attributed to the combined effect of lower bainite dominated microstructure along with precipitation hardening. The satisfactory low-temperature toughness is promoted by low finish rolling temperature and higher amount of misorientation offered by the boundaries within the lower bainite.
机译：成功设计和加工具有大于1700MPa拉伸强度和良好的低温冲击韧性的低碳Cu-Ni-Mo-Ti-Nb钢用于汽车，防御和结构应用。钢是在不同的轧制温度（750-850℃）的热机械控制，并在两个不同的条件下冷却：空气冷却和淬火。微观结构和沉淀物的进化彻底地表征了了解不同因素，例如钢组合物，结束轧制温度和冷却速率对机械性能的影响。结果表明，在750摄氏度的轧制温度（FRT）下加工钢，其水猝灭表现出优异的拉伸性能，屈服强度为1034-1449MPa，拉伸强度为1598-1726MPa，总伸长率为10-13％ 。这种超高强度水平主要归因于下贝氏体主导的微观结构以及沉淀硬化的综合作用。通过低结束轧制温度和较高贝氏体内的界限提供的较高卷取的较高的错误化促进了令人满意的低温韧性。

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