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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Microstructural Control and DWTT Toughness in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels
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Microstructural Control and DWTT Toughness in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels

机译：厚壁Nb-Ti-V微合金管线钢的组织控制和DWTT韧性

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摘要

Production of thick-walled low C Nb-Ti-V microalloyed linepipe steel has recently commenced in South Africa. Generally, the DWTT failures occurred when the average ferrite grain size was larger than 5μm and the pearlite colonies were coarse. This work examined the hot strip rolling behaviour of Nb-Ti-V microalloyed steel and quantified the most important parameters influencing final grain size and, hence, toughness. A Gleeble 1500 was used to both simulate hot rolling of relatively thick strip and also determine the no-recrystallisation temperature. For a fixed composition, final grain size was mainly controlled by the amount of strain applied below the no-recrystallisation temperature, which was determined by the roughing mill exit temperature.
机译：最近在南非开始生产厚壁低碳Nb-Ti-V微合金管线钢。通常，当平均铁素体晶粒尺寸大于5μm且珠光体集落较粗糙时，发生DWTT破坏。这项工作检查了Nb-Ti-V微合金钢的热轧带钢行为，并量化了影响最终晶粒尺寸和韧性的最重要参数。使用Gleeble 1500来模拟相对较厚的带钢的热轧，并确定无再结晶温度。对于固定的成分，最终晶粒尺寸主要由施加在不重结晶温度以下的应变量控制，该温度由粗轧机出口温度确定。

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