贝氏体钢轨钢成分偏析带对摩擦磨损性能的影响

以实际使用的含有成分偏析带的贝氏体钢轨钢为研究对象,利用端面摩擦磨损试验机研究贝氏体钢在不同偏析角度下磨损性能的变化及组织变化规律。结果表明:贝氏体钢轨钢的磨损机理主要表现为粘着磨损、磨粒磨损和氧化磨损;基体局部在较大摩擦力的作用下会沿着磨损方向整体剥离,形成鱼鳞状纹理;随着载荷的增大,在磨损表面和纵截面亚表层会产生了大面积的剥离坑,同时还有大量的微裂纹形成;在不同偏析角度下贝氏体钢表现出不同的耐磨性能,在偏析位置为90°时,磨损失重速率显著增大,磨损量较大,符合铁路尤其是曲线段晃车抖车导致的磨损量增加的现象,而在偏析位置为45°时磨损量最少,表现出最好的耐磨性。

Residual curvature migration velocity analysis for angle domain common imaging gathers

Pre-stack depth migration velocity analysis is one of the keys to influencing the imaging quality of pre-stack migration.In this paper we cover a residual curvature velocity analysis method on angle-domain common image gathers（ADCIGs） which can depict the relationship between incident angle and migration depth at imaging points and update the migration velocity.Differing from offset-domain common image gathers（ODCIGs）,ADCIGs are not disturbed by the multi-path problem which contributes to imaging artifacts,thus influencing the velocity analysis.On the basis of horizontal layers,we derive the residual depth equation and also propose a velocity analysis workflow for velocity scanning.The tests to synthetic and field data prove the velocity analysis methods adopted in this paper are robust and valid.

莱钢炼铁厂九辊布料器改造

通过对莱钢炼铁厂九辊布料器辊子外形尺寸、材质及偏析角度等多方面进行改造,解决了九辊布料器辊子磨损严重、断裂、使用寿命过短等问题,创造了良好的经济效益。