共查询到19条相似文献,搜索用时 53 毫秒
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碳氮共渗-深层稀土硼碳氮共渗复合处理在20Cr钢耐火砖模具中的应用 总被引:1,自引:0,他引:1
在20Cr钢耐火砖模具表面进行了碳氮共渗-深层稀土硼碳氮共渗复合处理的生产试验研究.结果表明,复合处理硬化层的硬度梯度较平缓,稀土硼碳氮共渗层、碳氮共渗层以及基体形成了冶金结合,使模具寿命提高了80%以上. 相似文献
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对45钢、20CrMnTi钢、3Cr2W8V钢稀土硼碳氮共渗层的抗氧化性、耐腐蚀性进行了测试分析。试验结果表明,稀土硼碳氮共渗层对基体氧化和腐蚀具有很好的保护作用,尤其是共渗后的20CrMnTi钢的抗氧化性和3Cr2W8V钢的耐腐蚀性分别提高33.3%、33.1%,为该工艺的推广应用提供了参考。 相似文献
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稀土在离子氮碳共渗中的应用 总被引:5,自引:0,他引:5
采用光学显微镜、显微硬度计、X射线衍射仪和俄歇能谱仪等手段研究了稀土及稀土加入量、共渗时间对渗层厚度、硬度及渗层组成的影响。研究结果表明,稀土对离子氮碳共渗过程有明显的催渗作用,尤其是一些难渗氮的奥氏体不锈钢。在给定条件下,稀土的催渗效果有一最佳含量。稀土对渗层相组成也有影响。 相似文献
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研究了稀土氮碳硼共渗对45钢疲劳性能的影响。结果表明,稀土氮碳硼共渗处理后,45钢疲劳寿命显著提高,裂纹形成延迟,裂纹扩展速度降低。表面出现残余压应力和表面硬度提高是稀土氮碳硼共渗处理改善45钢疲劳性能的主要原因。 相似文献
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12Cr4Ni4Mo4V钢经碳氮共渗,渗硼复合表面改性处理,使高硬硼化物层以下形成具备高塑韧性的复合淑层组织。 相似文献
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Q235钢表面复合强化处理后的拉伸强度 总被引:1,自引:0,他引:1
在Q235钢表面进行等离子渗铬和铬-钼、钨-钼共渗,然后进行等离子超饱和渗碳、淬火及回火处理,获得表面强化层.并对处理后的材料进行了拉伸试验.结果表明:基体的屈服强度和抗拉强度分别为669.48 MPa和696.74MPa,而经过表面复合强化处理后,材料的屈服强度最低为834.53 MPa,最高为1310.17 MPa;抗拉强度最低为957.38MPa,最高为1508.19 MPa.极大地改善了Q235钢的拉伸性能.而且经4 h等离子渗铬及后续热处理后,材料的拉伸强度提高更显著. 相似文献
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ZHOU Hai CHEN Fei YAO Bin ZHANG Jian-jun CHEN Li Beijing Institute of Petro-Chemical Technology Collage of Mechanical Engineering China 《材料热处理学报》2004,(5)
GAS multi-elements penetrating technology is a newsurface hardening technology developed on the basisof carbonitriding technology.It can not only shortenthe production period,but also improve the mechanicalperformances of the parts,such as torsional strength,flexural strength,wear resistance,and fatigue resistance"'.It features low-temperature multi-elementspenetration that the physical chemistry process ofoxidation-reduction generates the active atoms in thepart surface.In the beginning,the … 相似文献
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Gas multi-elements Penetration is a new surface hardening technology to improve the performance of the surface.In this paper, we focus on the study on the influence of multi-elements penetration on hardness of GCr15 bearing steel surface by C-N-O multi-elements penetrating treatment, and analyze the three elements, C, N and O in the surface with an EDX. Analysis of SEM images shows that there forms a penetrated layer 75 μ m or so in thickness over the surface, in which,0-30 μ m is the passivation layer, 30-60 μ m, the bright layer, and 60-75, the transition layer. 相似文献
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目的研制一种新型硅烷复合物,以替代传统的铬酸盐钝化液对铝材进行表面处理。方法将KH-560和A-151两种偶联剂进行复合,并添加合成的水性聚酯水解促进剂和带有活性基团的交联剂R,考察偶联剂配比、水解促进剂和交联剂R的用量对处理液稳定性及硅烷膜耐腐蚀性的影响。结果当KH-560与A-151的质量比为4∶1,水解促进剂的质量分数为0.4%~0.6%时,处理液的储存时间超过90天,硅烷膜也具有良好的耐腐蚀性能。对于储存后性能下降的处理液,添加4%(占处理液质量的百分比)的交联剂R后,即能在硅羟基之间形成明显的交联作用,有效增强硅烷膜的防护性能。结论该硅烷复合物的综合性能达到了工业化应用要求,可解决铬酸盐钝化液对环境的污染问题,具有良好的社会效益。 相似文献
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SUN Cai-yun'''' Xffi Ji-jia '''' WU Xiao-lei'''' HONG You-shi'''' LIU Gang LU Jian LU Ke . State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing People''''s Republic of China . Shenyang National Laboratory for Materials Sciences Institute of Metal Research Chinese Academy of Sciences Shenyang People''''s Republic of China . LASMIS University of Technical of Troyes Troyes France 《材料热处理学报》2004,(5)
THE FABRICATION of the nanocrystalline(NC)surface layer on bulk metallic materials has beenattracting rapidly increasing interest because excitingnew mechanical and physical properties can beexpected.A recently developed technique,the surfacemechanical attrition treatment(SMAT)[1],has shownto be capable of generating the NC surface layer invarious metals and alloys[2-5].This kind of surfacenanocrystallization is achieved through creatinglocalized severe plastic deformation,leading toco… 相似文献
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The surface mechanical attrition treatment (SMAT) technique was developed to synthesize a nanocrystalline (NC)layer on the surface of metallic materials for upgrading their overall properties and performance. In this paper, by means of SMAT to a pure zirconium plate at the room temperature, repetitive multidirectional peening of steel shots (composition (wt%): 1C, 1.5Cr, base Fe) severely deformed the surface layer. A NC surface layer consisting of the intermetallic compound FeCr was fabricated on the surface of the zirconium. The microstructure characterization of the surface layer was performed by using X-ray diffraction analysis, optical microscopy, scanning and transmission electron microscopy observations. The NC surface layer was about 25 μm thick and consisted of the intermetallic compound FeCr with an average grain size of 25+10 nm. The deformation-induced fast diffusion of Fe and Cr from the steel shots into Zr occurred during SMAT, leading to the formation of intermetallic compound. In addition, the NC surface layer exhibited an ultrahigh nanohardness of 10.2 GPa. 相似文献