32Cr2Mo2NiVNb钢盐浴氮化工艺

发布时间：2018-10-23 08:32

【摘要】：目的将盐浴氮化工艺用于32Cr2Mo2NiVNb钢的表面处理。方法采用盐浴氮化工艺处理32Cr2Mo2NiVNb钢,通过对金相组织、力学性能、断口形貌、耐蚀性能、高温耐磨性能等的测试分析,研究该工艺对32Cr2Mo2NiVNb钢组织和性能的影响,验证该工艺对32Cr2Mo2NiVNb钢的适用性。结果32Cr2Mo2NiVNb钢盐浴氮化后,基体组织为均匀的细针状索氏体+少量游离铁素体,渗氮层深度约为0.23 mm,化合物层深度均匀,约为17μm,渗氮层疏松度、氮化物、脆性评级均达到1级;表面硬度为1011HV0.3,较氮化前提高153.4%;抗拉强度、拉伸断口形貌均无明显变化,断后伸长率、断面收缩率、冲击吸收能量仅小幅降低;耐中性盐雾时间为镀硬铬试样的6.3倍;经190 s高温磨损的表面磨痕细小均匀,磨损失重较镀硬铬试样降低62.8%。结论盐浴氮化工艺不损害32Cr2Mo2NiVNb钢组织、强度等,仅使塑性、韧性指标小幅降低,相较于镀硬铬工艺,可显著提高32Cr2Mo2NiVNb钢的耐蚀性、高温耐磨性,对32Cr2Mo2NiVNb钢的工艺适用性良好。
[Abstract]:Aim to apply the salt bath nitriding process to the surface treatment of 32Cr2Mo2NiVNb steel. Methods 32Cr2Mo2NiVNb steel was treated by salt bath nitriding process. The effect of this process on the microstructure and properties of 32Cr2Mo2NiVNb steel was studied by testing and analyzing the metallographic structure, mechanical properties, fracture morphology, corrosion resistance and wear resistance at high temperature. The applicability of the process to 32Cr2Mo2NiVNb steel was verified. Results after 32Cr2Mo2NiVNb steel was nitrided in salt bath, the matrix structure was a small amount of fine needle-like ferrite, the depth of nitriding layer was about 0.23 mm, compound layer, the depth of nitriding layer was about 17 渭 m, the degree of nitriding layer was loose, nitride and brittleness grade were all up to 1 grade. The surface hardness is 1011HV0.3, which is 153.4 higher than that before nitridation, the tensile strength and tensile fracture morphology have no obvious change, the elongation after break, the cross section shrinkage, the impact absorption energy are only slightly reduced, and the neutral salt spray resistance time is 6.3 times of that of hard chromium plating. After 190 s high temperature wear, the wear marks are fine and uniform, and the wear weight loss is 62.8% lower than that of hard chromium plating. Conclusion the salt bath nitriding process does not damage the structure and strength of 32Cr2Mo2NiVNb steel, but only reduces the ductility and toughness. Compared with the hard chromium plating process, the corrosion resistance and high temperature wear resistance of 32Cr2Mo2NiVNb steel can be improved significantly, and the applicability of the process to 32Cr2Mo2NiVNb steel is good.
【作者单位】：海装重庆军代局;西南技术工程研究所;
【分类号】：TG174.4

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