The source of inclusion in IF steel end slabs after reducing the casting remnant were studied by means of total oxygen and nitrogen content analysis, original position analyzer for metal (OPA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Slims. The results show that: reducing the casting remnant have little influence on reoxidation in continuous casting process, the size of micro-inclusions are mostly smaller than 5 μm. The size of large-sized inclusions in end slab are mainly trapped in mold, they are mostly from 140 μm to 300 μm and over 300 μm, which accounted individually for 19.94% and 73.21% of total large-sized inclusions. In the end of a cast, decreasing the casting speed with slower speed changing rate can decrease the slag entrainment index of hot rolled coils from end slabs.
In this paper, we studied the method of calculating IFS code and auto-generated the fractal images based on IFS codes. The IFS codes of the English alphabet were calculated respectively, and the fractal images were generated in accordance with the IFS codes by using the Visual Basic program, then textile patterns were designed with the fractal images.
The effects of multiple repairing-weld and TIG-dressing on the fatigue property of high
strength steel weld joints used in platform have been investigated. Through the fatigue tests on high
strength steel welded joint samples, the life estimating formula is obtained after each time of
repairing weld and TIG-dressing. The S-N curve and the equation after repairing weld and
TIG-dressing are given. The work in this paper offers an important basis for the multiple
repairing-weld of platforms.
This paper presents a boundary element-free computational method for the fracture analysis of 2-D anisotropic bodies. The study starts from a derived traction boundary integral equation (BIE) in which the boundary conditions of both upper and lower crack surfaces are incorporated into and only the Cauchy singular kernal is involved. The boundary element-free method is achieved by combining this new BIE and the moving least-squares (MLS) approximation. The new BIE introduces two new variables: the displace density and The dislocation density. For each crack, the dislocation density is first expressed as the product of the characteristic term and unknown weight function, and the unknown weight function is approximated with the MLS approximation. The stress intensity factors (SIFs) can be calculated from the the weight function. The examples of the straight and circular-arc cracks are computed, and the convergence and efficiency are discussed.
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