@InProceedings{SilvaUedaMellLepi:2007:EfPrTe,
               author = "Silva, Leide Lili Gon{\c{c}}alves da and Ueda, M{\'a}rio and 
                         Mello, Carina Barros and Lepienski, C. M.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal do 
                         Paran{\'a} (UFPR)}",
                title = "Effects of the Process Temperature of Plasma Immersion Ion 
                         Implantation (PIII) of Nitrogen on Microstructure, Hardness and 
                         Wear Resistance of AISI H13 Steel",
                 year = "2007",
         organization = "Encontro Brasileiro de F{\'{\i}}sica dos Plasmas, 9.",
             abstract = "Nowadays, there are several techniques adequate for enhancing the 
                         physical and chemical properties of diŽerent materials. PIII is 
                         one of these techniques which has reached success because it makes 
                         it possible to treat irregularly shaped samples, perform batch 
                         processing, has low hardware cost and allows conducting treatments 
                         at diŽerent temperatures. In the present study we investigate the 
                         in°uence of the treatment temperatures from 300ēC up to 720ēC on 
                         the microstructure of H13 steel samples and its eŽects on the 
                         hardness, composition, elastic modulus and wear resistance of the 
                         material. Nitrogen PIII treatment was carried out using a pilot 
                         plant system with a glow discharge plasma source. The implantation 
                         parameters were as follows: pulse width of 40 šs, pulse repetition 
                         rate of 400 Hz, treatment time of 3h and implantation voltage of 
                         5.0 kV. Cross-section scanning electron micrographs of the H13 
                         steel samples showed a martensite structure for the standard 
                         sample and also for the samples treated at 300ēC and 470ēC. As the 
                         temperature increases to up to 620ēC and 720ēC, the martensite 
                         structure is modi¯ed to small particles of Fe3C, then transformed 
                         into spheroidal form in the FeŽ matrix. For all SEM micrographs, 
                         no phase formation was seen. This behavior is in agreement with 
                         the XRD results because no evidence of nitride compounds was 
                         detected. The surface hardness value was higher (7.0 GPa) for the 
                         PIII-treated sample at 470ēC but when the temperature increased to 
                         up to 720ēC, a decrease of the hardness (4.0 GPa) occurred. 
                         Despite of this unfavorable behavior at higher temperatures, 620ēC 
                         and 720ēC, the nitrogen penetration depth of about 12 šm was 
                         measured by GDOS. This fact associated with XRD and SEM results 
                         suggest that the N implanted in H13 steel stays in a solid 
                         solution. There was an improvement of the wear resistance as the 
                         temperature increases. The wear volume of the sample treated at 
                         720ēC is about 120.0 mm3 that is 4.5 lower than that one attained 
                         for untreated specimen. Additionally, the elastic modulus 
                         diminished from 184 GPa for standard sample down to 159 GPa for 
                         sample treated at 720ēC.",
  conference-location = "S{\~a}o Pedro, SP",
      conference-year = "25-28 Nov.",
             language = "pt",
        urlaccessdate = "15 jun. 2024"
}