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介绍了高线预精轧机使用的轧辊(辊环)的工作条件和要求。分析了合金铸铁、合金工具钢、碳化钨基硬质合金等各类材质的辊环适宜的使用条件和结果。 相似文献
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《锻压装备与制造技术》1975,(6)
随着我国工农业生产的飞跃发展,国民经济的许多部门,要求提供性能良好的模具材料。钢结硬质合金具有一般工具钢的可加工性、可热处理性、可焊接性和可锻性,又具有硬质合金的高硬度和高耐磨性,同时,可节省进口物资钴。因此,推广应用钢结硬质合金符合总路线的精神,近年来,在国内得到了迅速发展。碳化钨基钢结硬质合金其性能与碳化钛基钢结硬质合金相似,前者能在氢气中 相似文献
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生产超细晶钢的耐低温大压下轧制用轧辊是使用WC系陶瓷材和钢实现内外层金属结合的复合式轧辊。为了在高轧制负荷下工作,该种复合轧辊须有足够的内外层结合强度,以前曾有报导,认为外层陶瓷和钢内层的结合强度(抗拉强度)需要1000MPa。日本日立金属为了弄清结合强度的规律,研究了接合条件对超级陶瓷轧辊内外层结合强度的影响,制作接合试样进行强度的评价。 相似文献
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电冶熔铸WC/钢复合材料中WC的溶解行为 总被引:9,自引:0,他引:9
用电冶熔铸工艺制备不同WC含量的WC/钢复合材料,研究了WC颗粒在复合材料钢基体中的溶解行为和影响因素.结果表明:随着WC含量的增加,碳化物从钢基体晶界处分布逐渐转向晶内分布;随着WC颗粒尺寸的增大,在WC颗粒与钢基体界面处形成一层反应物,它阻止了WC颗粒在钢基体中的进一步溶解,同时也提高了两相界面的结合强度.通过调整电冶熔铸工艺参数和WC颗粒的尺寸及含量,可以控制WC颗粒在复合材料中的溶解行为. 相似文献
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石墨钢是近年来广泛采用的轧辊新材质.用这种材质生产的轧辊兼有铸钢轧辊和铸铁轧辊的优点,即具有高的耐磨性、高的耐热疲劳性和优良的抗折性能.在初轧机上使用这种轧 相似文献
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电冶熔铸WC/钢复合材料的显微缺陷 总被引:10,自引:1,他引:10
采用电冶熔铸工艺将废弃的WC钢结硬质合金制备成WC/钢复合材料, 研究了复合材料中显微缺陷的形貌及形成机理.结果表明: 电冶熔铸WC/钢复合材料的气孔及夹杂含量少, 可有效解决WC颗粒的偏析.X射线衍射、扫描电镜和透射电镜分析显示, WC颗粒和钢基体界面上发生了界面反应, 生成了高稳定性的Fe3W3C界面层. 相似文献
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《Science & Technology of Welding & Joining》2013,18(3):231-236
AbstractIn this work, the feasibility of friction stir lap welding an aluminium alloy (Al-5083) to the aluminium clad steel sheet was studied. The welded joints were characterised by various methods including shear–tensile test and optical microscopy and scanning electron microscopy. The results indicated that sound and defect free joints were obtained. The fracture loads of the samples reached up to 94% compared with that of the steel base metal. Moreover, the joint strength linearly increased with the decrease in thickness of the aluminium layer roll bonded on the steel sheet. It was also shown that welding rotation and travel speed variation did not considerably impact the fracture loads in the studied range. 相似文献
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J. An Y. Lu D. W. Xu Y. B. Liu D. R. Sun B. Yang 《Journal of Materials Engineering and Performance》2001,10(2):131-135
In this paper, the basic bonding mechanism between two materials of practical importance is identified. One of the materials
is carbon steel, which has been aluminized on its surface by immersion in molten aluminum. This step produced a Fe-Al intermetallic
compound layer. The other material is an Al-Pb alloy (a bearing material). The two materials were hot roll bonded together.
It was found that the Fe-Al intermetallic compound broke into discontinuous blocks during the hot rolling operation. The block
of intermetallic compound remained bonded to the steel. The overall bond between the Al-Pb strip and the steel strip resulted
from two different bonds. The Al-Pb strip and the Fe-Al intermetallic compound (this is called the “block bond” in this paper)
and the Al-Pb strip and the bare steel surface in the area where the block separated from the steel substrate (this is called
the “blank bond” in this paper).
The effects of dipping time and thickness of the intermetallic layer as well as the fractional amount of blank interfaces
on the interfacial bonding strength were investigated. The total bonding strength mainly depended on that of blank interfaces
and the area fraction of blank interfaces. There was a linear relationship between total bonding strength and fraction of
blank interfaces. The bonding strength of blank interfaces was four times as high as that of the block interfaces. The fraction
of blank interfaces increased with increasing intermetallic thickness values below 73 μm and decreased beyond 73 μm. 相似文献
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介绍了辽宁中车轨道交通装备有限公司连续热轧热弯哈芬槽钢生产线的工艺特点、主要设备和孔型系统,提出了热轧哈芬槽钢生产中存在坯料宽度选择、中间坯尺寸控制和连续热弯成形3个关键问题及相应的解决办法。 相似文献
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Core filling process of cast high speed steel roll was simulated. Ductile iron was used as core material. The influences of filling parameters, such as core filling time and core filling temperature, on the filling process were investigated. Based on the simulated results, optimal core filling parameters were determined. The predicted temperature fields show that the temperature at the roll shoulder is the lowest during the core filling process and usually causes binding defects there. Method for solving this problem was presented. 相似文献
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对比了用于Φ100m m 自动轧管机组均整机的60SiMnMo 钢和ZUB140CrMo 半钢轧辊使用情况。试验表明, ZUB140CrMo 半钢轧辊具有硬度落差小, 耐磨性好等优点, 是均整机轧辊的理想材料。 相似文献