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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 >Some Physical Metallurgy Aspects of High Strength Hot Rolled Nb-Ti Microalloyed Steels with Superior Fracture Resistance and Formability
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Some Physical Metallurgy Aspects of High Strength Hot Rolled Nb-Ti Microalloyed Steels with Superior Fracture Resistance and Formability

机译：高强度抗断裂和可成形性高强度热轧Nb-Ti微合金钢的一些物理冶金学方面

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摘要

High strength hot rolled microalloyed steels were processed using niobium-titanium microalloying approach to obtain yield strength of 420-770 MPa. Ferrite microstructure was the basis for processing lower yield strength 420-630 grade while ferrite-bainite microstructure was the basis for processing the ultra-high strength 690-770 MPa grades. The advantage of the elements, boron and molybdenum, was used to obtain the bainite. The effectiveness of Nb is controlled by the amount of C, N, and the Ti/N ratio to obtain the desired combination of high strength and toughness. The superior fracture resistance and edge formability of these steels is due to the cumulative contribution of fine grain size and high intensity of the required {332}< 113 > texture. These characteristics add to the benefits derived from the bainitic constituent in ultra-high strength 690-770 MPa grades.
机译：使用铌钛微合金化方法对高强度热轧微合金钢进行处理，以获得420-770 MPa的屈服强度。铁素体显微组织是加工较低屈服强度420-630级的基础，而铁素体贝氏体显微组织是处理超高强度690-770 MPa级的基础。利用硼和钼元素的优势来获得贝氏体。 Nb的有效性由C，N和Ti / N比的量控制，以获得所需的高强度和韧性的组合。这些钢卓越的抗断裂性和边缘成形性归因于细晶粒尺寸的累积贡献和所需{332} <113>织构的高强度。这些特性增加了贝氏体成分在690-770 MPa超高强度等级中获得的好处。

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