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TOUGHNESS ANISOTROPY IN FOUR X70 PIPELINE STEELS PRODUCED VIA DIFFERENT ROLLING PRACTICES

机译：通过不同的轧制实践生产的四个X70管道钢中的韧性各向异性

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The effects of microstructure and crystallographic texture in four commercially-produced API X70 pipeline steels and their relation to planar anisotropy of toughness were evaluated. The experimental steels were processed through either a hot strip mill, a Steckel mill, or a compact strip mill. Different processing routes were selected to obtain plates with potential variations in the microstructure and anisotropic characteristics. Charpy impact testing was used to evaluate the toughness in different orientations with respect to the rolling direction. Toughness was lower in the 45° orientation for all plates. Microstructural and texture analyses were performed using electron backscattered diffraction to evaluate the factors leading to the anisotropy in toughness. It was concluded that crystallographic texture is the main cause for the lower toughness in the 45° direction and an analysis based on a consideration of the effects of texture on susceptibility to cleavage fracture leading to higher transition temperatures is presented.
机译：评估了三种商业化的API X70管道钢中微观结构和晶体纹理的影响及其与平面韧性各向异性的关系。通过热带轧机，Steckel磨机或紧凑型轧机处理实验钢。选择不同的加工路线以获得具有微观结构和各向异性特性的具有潜在变化的平板。夏比冲击试验用于评估不同取向的韧性相对于滚动方向。所有板的45°定向韧性较低。使用电子背散射衍射进行微观结构和质地分析，以评估导致韧性各向异性的因素。得出结论是，结晶纹理是45°方向韧性较低的主要原因，并基于介绍了施用裂解骨折易感性易感性的易感性的影响。

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