排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Bezlyud'ko G. Ya. Muzhitskii V. F. Krutikova L. A. Kazyukevich I. L. Popov B. E. 《Russian Journal of Nondestructive Testing》2002,38(4):225-230
The magnetic method on the basis of the coercive force Hc is proposed to use for estimating the current condition and the residual lifetime of forming rolls. Sixty rolls have been tested. It is shown that Hc increases almost twice in exploiting the roll from the beginning of the operation to reaching the limit of its lifetime. Results of observation of the degree of nonuniformity of the Hc distribution over the roll surface in the operation process are given. The results of investigation make it possible to optimize the path of each roll through the mill stands in order to avoid the stress concentration at the same depth of the roll operating (magnetic) coating in the roll change process. Using the magnetic testing method based on Hc makes it possible effectively to estimate the current condition of accumulation of the fatigue in the roll operating (magnetic) coating. 相似文献
8.
This article is devoted to the formation of amorphous coatings on the steel 35 surface by electrospark treatment in a mixture of crystalline granules. It is revealed by the energy dispersive X-ray spectroscopy (EDS) that formed coatings contain W, Mo, Co, and Ni in various ratios. The weight of granules of various compositions decreases by 11–16 wt % for 6-h treatment due to electric erosion. The mass transfer coefficient varies in a range from 33 to 54%. X-ray structural analysis showed the prevalence of an amorphous phase (81–99%) in the structure of deposited layers. Annealing of coatings at a temperature above 1150°C leads to the crystallization of the amorphous phase into boron carbide of the M23(C, B)6 type, as well as into α-Fe. The coatings have an increased hardness of 10–15 GPa, while their wear resistance in the dry sliding wear mode under loads of 10 and 50 N is higher than for steel 35 by a factor of 3.3 and 1.6. The coating friction coefficient is lower than for steel 35 by 13–30% and was 0.27–0.31. The wear resistance of coatings in a dry abrasive wear mode is higher by a factor of 3–5 when compared with uncoated steel 35. The best characteristics are inherent without nickel and worst are inherent without cobalt. Thus, it is established that tungsten and cobalt increase the wear resistance of iron-based amorphous alloys, while nickel and molybdenum tend to worsen their tribotechnical behavior. 相似文献
9.
Shaptala V. V. Logachev K. I. Averkova O. A. Krutikova D. N. 《Refractories and Industrial Ceramics》2020,60(6):636-641
Refractories and Industrial Ceramics - The results of modeling the processes of capturing harmful emissions from galvanic baths or other tanks with an open surface are presented. An approach based... 相似文献
10.