共查询到18条相似文献,搜索用时 46 毫秒
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对1Crl3马氏体不锈钢进行了辉光离子氮化处理试验,并对氮化试样的金相和硬度进行了分析测定。结果表明520℃辉光离子氮化8h,使1Crl3马氏体不锈钢的氮化层浓度达到0.25mm,最高硬度达到HV732,约为基体硬度的4倍。 相似文献
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分析了马氏体不锈钢CO2气体保护焊的焊接特点,基于其焊接冷裂纹、残余内应力、焊接后组织发生改变等问题,介绍了马氏体不锈钢CO2气体保护焊的焊接工艺要点,通过这些措施可以很好地解决上述问题,保障焊接质量. 相似文献
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对11Cr17马氏体不锈钢进行了浸硫氮化处理,利用金相显微镜和显微硬度计测量了渗层的厚度及硬度梯度,在MM-200磨损试验机上分别进行了干磨和油磨的耐磨试验,并用三维超景深显微镜测量了磨痕面积.研究结果表明:11Cr17浸硫氮化试样比11Cr17未处理试样的耐磨性能大幅度提高;11Cr17浸硫氮化与M2高速钢未表面处理相比,油磨性能相当,但干磨性能较后者好. 相似文献
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在大量试验的基础上,深入分析并研究了马氏体不锈钢活塞环渗氮畸变的各项影响因素。结果表明,活塞环的渗氮畸变主要是由于活塞环外圆工作面渗氮层的残余压应力导致。尽管环的内圆面是非工作面并不需要渗氮,但作者将活塞环内圆面和外圆面同时进行渗氮,使内外圆面渗氮层的残余压应力得以平衡,从而顺利解决了渗氮畸变难题。 相似文献
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A series of experiments were carried out to study the influence of low temperature plasma nitriding on the mechanical properties of AISI 420 martensitic stainless steel. Plasma nitriding experiments were carried out for 15 h at 350℃ by means of DC- pulsed plasma in 25%N2+ 75%H2 atmosphere. The microstructure, phase composition, and residual stresses profiles of the nitrided layers were determined by optical microscopy and X-ray diffraction. The microhardness profiles of the nitridied surfaces were also studied. The fatigue life, sliding wear, and erosion wear loss of the untreated specimens and plasma nitriding specimens were determined on the basis of a rotating bending fatigue tester, a ball-on-disc wear tester, and a solid particle erosion tester. The results show that the 350℃ nitrided surface is dominated by c-Fe3N and ON, which is supersaturated nitrogen solid solution. They have high hardness and chemical stabilities. So the low temperature plasma nitriding not only increases the surface hardness values but also improves the wear and erosion resistance. In addition, the fatigue limit of AISI 420 steel can also be improved by plasma nitriding at 350℃ because plasma nitriding produces residual compressive stress inside the modified layer. 相似文献
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目的 通过离子渗氮和固溶复合处理制备深层含氮奥氏体不锈钢,获得硬度、耐蚀性和耐磨性等综合性能优良的奥氏体不锈钢。方法 将304奥氏体不锈钢试样放在LD-8CL型直流等离子体渗氮炉内,在400 Pa下进行560 ℃、4 h的离子渗氮处理,渗氮后进行1050 ℃、8 h的固溶处理。使用HXD-1000TMC型显微硬度计、DMI-3000M型金相显微镜、D/max-2500型X射线衍射仪(XRD)、Thermo250XI型X射线光电子能谱仪(XPS)、CS 350电化学测量系统和万能摩擦磨损试验机,对经过复合处理的304不锈钢的截面硬化梯度、截面组织、物相、表面成分、耐蚀性和耐磨性进行研究分析,验证此复合处理对获得硬度高、耐蚀性和耐磨性好等综合性能优良的奥氏体不锈钢的适用性。结果 经过复合处理,不锈钢表面的氮原子数分数为1.56 %,且为单一奥氏体相?N。?N所对应的衍射峰相对于不锈钢基体向左偏移,有效硬化层深达1.0 mm,不锈钢的表面硬度从基体的210HV0.025提高到308HV0.025。不但提高了深层含氮奥氏体不锈钢的耐磨性,而且提高了不锈钢的耐蚀性,腐蚀电位从基体的-0.534 V提高到-0.422 V,摩擦系数由基体的0.8降到0.7。结论 离子渗氮和固溶复合处理适用于制备综合性能优良的深层含氮奥氏体不锈钢。工艺设计时,可以根据材料服役要求,选择合适的固溶工艺,从而获得满足不同综合性能要求的含氮不锈钢。 相似文献
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JIShi-jun GAOYu-zhou WANGLiang SUNJun-cai HEIZu-kun 《材料热处理学报》2004,25(5):425-427
The dc glow discharge plasma nitriding of austenite stainless steel with severe surface deformation layer is used to produce much thicker surface modified layer. This kind of layers has useful properties such as a high surface hardness of about 1500 Hv 0.1 and high resistance to frictional wear. This paper presents the structures and properties of low temperature plasma nitrided austenitic stainless steel with severe surface deformation layer. 相似文献