夹杂物对超高强度钢应力应变场的影响

发布时间：2018-03-14 11:06

本文选题：超高强度钢　切入点：夹杂物　出处：《工程科学学报》2017年07期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:The influence of non-metallic inclusions on the properties of steels is closely related to the characteristic parameters of inclusions. Firstly, the in-situ SEM observation results of crack initiation caused by tin inclusions in ultra-high strength steels under tensile and fatigue loads are analyzed. The stress fields of inclusions and their surrounding substrates were calculated by MSC Marc finite element analysis software, and the stress and strain fields of Ti N inclusions with different characteristic parameters under tensile load were simulated. The finite element method can explain and predict the mechanical behavior of inclusions and the surrounding matrix. The stress concentration is the most serious near the sharp angle of triangular inclusions. As the distance between adjacent inclusions increases, The maximum stress in the substrate is shifted from the outside of the inclusions to between the inclusions. The near surface inclusions make the high stress region appear near the free surface of the matrix. The position of the maximum stress in the matrix is affected by the distance and size of the inclusions and the free surfaces.
【作者单位】：北京科技大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51371023)
【分类号】：TG142.13

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