共查询到17条相似文献,搜索用时 93 毫秒
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基于深冷处理提供的温度场和永磁体提供的匀强磁场,对42CrMo合金钢进行磁场深冷处理,并与常规工艺和深冷处理工艺进行了对比分析。结果表明:磁冷工艺在深冷处理工艺的基础上进一步提高了42CrMo钢的耐磨性,磁冷工艺处理材料的耐磨性较常规工艺和深冷工艺分别提高约26.7%和22.2%。这是由于深冷处理使得残留奥氏体进一步转化为马氏体;深冷处理也使得过饱和马氏体析出大量碳生成碳化物;深冷处理中磁场的存在对α-Fe晶格的作用使过饱和马氏体析出碳的方向得到优化,回火屈氏体在磁场方向致密聚集,耐磨性提高。 相似文献
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GCr15钢深冷处理工艺的研究 总被引:2,自引:1,他引:2
对GCr15钢经常规淬火后进行不同时间、不同次数的深冷处理所引起的性能变化进行了研究。结果表明,硬度、抗弯强度对冲击韧性等深冷时间关系不大;在深冷时间不太长的范围内(2h左右)相对耐磨性随时间延长逐渐提高;两次深冷处理可使相对耐磨性等进一步增大,更多次深冷处理不起作用。 相似文献
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钢渗碳后的深冷处理研究 总被引:2,自引:0,他引:2
研究孙参碳后深冷处理对20钢机械性能的影响,分析讨论了深冷处理的作用机理,实验结果表明,20钢渗碳淬火后经深冷处理,其硬度,强度及韧性均有不同程度的提高。 相似文献
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文中对铝合金焊接在外加磁场和深冷处理方面的研究进展进行了系统的综述,重点分析了外加磁场和深冷处理对铝合金焊接过程中电弧物理和宏观效果影响及其与焊接工艺之间的关系,并从微观相组织、力学性能、形成机理等不同尺度对微观组织方面的研究成果进行了综述和分析。结果表明,外加磁场的引入改变了焊接电弧的形态、熔滴过渡的方式、熔池中熔融金属的流动,在合适的磁场工艺参数下可以得到良好的焊缝组织和形态;深冷处理后铝合金的晶粒发生转动,并且细化,最终可使深冷处理部位的性能更加优异。该文为铝合金焊接在外加磁场和深冷处理方面的研究和应用提供一定的指导。 相似文献
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研究了深冷处理对Rm80钢力学与疲劳性能的影响。结果表明深冷处理使该钢的力学及疲劳性能普遍提高,尤其以第一次回火后深冷处理具有较好的综合效果。深冷处理过程中马氏体的分解、超微细碳化物的析出以及组织细化是该钢性能得以改善的主要原因。 相似文献
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Kamran Amini Amin Akhbarizadeh Sirus Javadpour 《Journal of Materials Engineering and Performance》2016,25(2):365-373
Deep cryogenic heat treatment is a supplementary process performed on steels specifically tool steels before tempering to improve the wear resistance and hardness of these materials. The carbide distribution changes via the electric current flow or the application of a magnetic field during the deep cryogenic heat treatment. Hence, the electric current and the magnetic field were applied to the samples to investigate the corrosion behavior of the deep cryogenically treated samples by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The results showed that increasing the carbide percentage and achieving a more homogenous carbide distribution during the deep cryogenic heat treatment will remarkably decrease the corrosion resistance due to a decrease in the solutionized chromium atoms in the structure as well as the increase in the martensite-carbide grain boundaries (the galvanic cell areas). Moreover, it was clarified that the electric current flow and magnetic fields reduce the carbide percentage, which leads to an increase in the corrosion resistance of these samples in comparison with the deep cryogenically treated samples. 相似文献
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Evaluation of factors influencing deep cryogenic treatment that affect the properties of tool steels
A. Oppenkowski S. Weber W. Theisen 《Journal of Materials Processing Technology》2010,210(14):1949-1955
Deep cryogenic treatment (DCT) of tool steels is used as an additive process to conventional heat treatment and usually involves cooling the material to liquid nitrogen temperature (−196 °C). This kind of treatment has been reported to improve the wear resistance of tools. In this study, the Taguchi method was used to identify the main factors of DCT that influence the mechanical properties and the wear resistance of the powder metallurgically produced cold-work tool steel X153CrVMo12 (AISI D2). Factors investigated were the austenitizing temperature, cooling rate, holding time, heating rate, and tempering temperature. In order to study the significance of these factors and the effect of possible two-factor interactions L27(313), an orthogonal array (OA) was applied to conduct several heat treatments, including a single DCT cycle directly after quenching prior to tempering. The results show that the most significant factors influencing the properties of tool steels are the austenitizing and tempering temperatures. In contrast, the parameters of deep cryogenic treatment exhibit a lower level of significance. Further investigations identified a nearly constant wear rate for holding times of up to 24 h. The wear rate reaches a minimum for a longer holding time of 36 h and increases again with further holding. 相似文献
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通过深冷处理前后Al-Zn-Mg-Cu合金在3.5%NaCl溶液中腐蚀速率的测试,结合电化学分析及金相和扫描电镜观察,研究了深冷处理对Al-Zn-Mg-Cu合金耐蚀性的影响。结果表明,深冷处理能显著减少Al-Zn-Mg-Cu合金中的第二相含量,从而有效提高Al-Zn-Mg-Cu合金的耐腐蚀性能。 相似文献