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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >The Relationship of Microstructure and Mechanical Properties of Hot Rolled Nb-microalloyed High Strength Rebar Steel
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The Relationship of Microstructure and Mechanical Properties of Hot Rolled Nb-microalloyed High Strength Rebar Steel

机译：Nb微合金化高强度钢筋的热轧组织与力学性能的关系

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摘要

In the recent process of industrial development & production of Nb sole microalloyed high strength rebar steel, the relationship of microstructure and mechanical properties has been studied. The most important findings are as follows: 1) In the Nb microalloyed rebar steel 20MnSiNb the bainite component is easy to occur and forms a complex ferrite+bainite+pearlite+martensite structure; 2) The bainite and/or martensite existing in the microstructure has close relationship with the continuous tensile stress-strain curve that lacks marked yield point; 3) Si and Mn contents have to be kept in proper ranges in order to monitor the required microstructure i.e. to reduce the fraction of bainite and/or martensite. 4) Smaller dimension of rebar and fast cooling lead to the sensibility of formation of bainite and martensite. Tempcore water-cooling application has to be carefully controlled in order to get proper microstructure.
机译：在Nb唯一的微合金高强度螺纹钢的工业开发和生产的最新过程中，已经研究了显微组织与机械性能的关系。最重要的发现如下：1）在Nb微合金钢20MnSiNb中，贝氏体成分容易出现，并形成复杂的铁素体+贝氏体+珠光体+马氏体结构; 2）存在于组织中的贝氏体和/或马氏体与缺乏明显屈服点的连续拉伸应力-应变曲线密切相关; 3）必须将Si和Mn的含量保持在适当的范围内，以便监测所需的微结构，即减少贝氏体和/或马氏体的含量。 4）较小的钢筋尺寸和快速冷却导致形成贝氏体和马氏体的敏感性。必须谨慎控制Tempcore水冷应用，以获取适当的微观结构。

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