Boriding of high-silicon stainless steel was performed by means of a fluidized bed method. The boride layer was analyzed using X-ray diffraction, GDS and EPMA. The high-temperature microhardness, dry friction, and wear resistance in air and corrosion resistance in 3% sodium chloride solution of borided high-silicon stainless steel were investigated. The obtained results are as follows: (1) The Knoop hardness of borided high silicon stainless steel was 2000 HK. The boride layer consisted of FeB and Fe2B. (2) The enrichment of Si, Ni, and Cu excluded from the borided compound was detected under the boride layer. (3) The high-temperature microhardness of high silicon stainless steel improved significantly with boriding. (4) The dry wear resistance of high silicon stainless steel with respect to SUJ2, SUS304, and Al2O3 in air improved with boriding, but the dry friction characteristic did not improved significantly. (5) The corrosion wear resistance of high silicon stainless steel with respect to against Al2O3 in 3% sodium chloride solution improved with boriding.
Laser speckle interferometry method can measure strain and displacement of material without contact. But, this method has a week point about the accuracy when applied to the rough surfaced object. Then, in this paper, laser speckle interferometry method was applied to measure the elastic properties of Hot-Dip Zn coated steel that has rough surface. The results are as follows. 1) Apparent Young's modulus of Hot-Dip Zn coated steel decreases with the increase of galvanized layer. 2) The Young's modulus of the (δ1+η) mixture layer and columnar layer, estimated by the compound rule and the multiple regression analysis, became 45.0GPa and 62.3GPa, respectively. 3) According to the above conclusions, the laser speckle interferometry method can be applied to measure the elastic properties of rough surfaced composite specimens.
Lamination of biaxially-oriented-polyester-film-laminated steel for can use is characterized by partial melting of the film on the surface of steel during lamination by pressing the supplied films between both sides of heated steel and a couple of cooled rubber rolls. Various characteristics of biaxially-oriented-polyester-film-laminated steel for can use are controlled by the degree of biaxial orientation and the thickness of the amorp hous layer of the laminated film. Research indicated that these characteristics deteriorate with an increase in laminating speed because of the decrease in the thickness of the amorphous layer even at the same degree of biaxial orientation, and maintaining contact cooling time for the laminated film effectively prevents a decrease in the thickness. Because high-speed laminating is indis-pensable for better productivity, methods of keeping the contact cooling time constant must be determined. Therefore, this report has proposed a new laminating process to maintain sufficient contact cooling time by winding the steel along the laminating roll to prevent a decrease in thickness for the amorphous layer of laminated film with an increase in laminating speed. Furthermore, the effects of laminating conditions on the cross-sectional distribution of biaxial orientation of polyester film were investigated by measuring birefringence by means of a retardation method.