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非金属夹杂物对钢性能的影响与夹杂物的特征参数密切相关.首先分析拉伸和疲劳载荷下超高强度钢中Ti N夹杂物导致裂纹萌生的扫描电镜原位观察结果,采用MSC Marc有限元分析软件对夹杂物及周围基体的应力场进行计算,然后对拉伸载荷下不同特征参数的Ti N夹杂物及周围基体的应力应变场进行模拟.结果表明,有限元法能够解释并预测夹杂物及周围基体的力学行为.三角形夹杂物尖角附近的应力集中最严重.矩形夹杂物内部高应力区的位置受夹杂物与外载荷方向夹角的影响.随邻近夹杂物间距的增大,基体内的最大应力由夹杂物外侧移至夹杂物之间.近表面夹杂物使得基体自由表面附近出现高应力区,基体内最大应力的位置受夹杂物与自由表面距离和尺寸的影响.
The influence of the non-metallic inclusions on the properties of the steel is closely related to the characteristic parameters of the inclusions.Firstly, the in situ scanning electron microscopy (SEM) observations of TiN inclusions in ultra-high strength steels under tension and fatigue loading were carried out, Element analysis software to calculate the stress field of inclusions and the surrounding matrix, and then simulate the stress and strain field of TiN inclusions with different characteristic parameters under tensile load and the surrounding matrix.The results show that the finite element method can explain and predict inclusion And the surrounding matrix.The stress concentration near the triangular inclusions is the most serious.The location of the high stress zone in the rectangular inclusions is affected by the angle between the inclusion and the external load.With the increase of the distance between adjacent inclusions, The maximum stress in the matrix moves from the outside of the inclusions to the inclusions.The near-surface inclusions make the high-stress area appear near the free surface of the matrix, and the location of the maximum stress in the matrix is affected by the distance and the size of the inclusions from the free surface.