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Characterization of AISI 4140 borided steels

机译：AISI 4140渗硼钢的特性

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摘要

The present study characterizes the surface of AISI 4140 steels exposed to the paste-boriding process. The formation of Fe_2B hard coatings was obtained in the temperature range 1123-1273 K with different exposure times, using a 4 mm thick layer of boron carbide paste over the material surface. First, the growth kinetics of boride layers at the surface of AISI 4140 steels was evaluated. Second, the presence and distribution of alloying elements on the Fe_2B phase was measured using the Glow Discharge Optical Emission Spectrometry (GDOES) technique. Further, thermal residual stresses produced on the borided phase were evaluated by X-ray diffraction (XRD) analysis. The fracture toughness of the iron boride layer of the AISI 4140 borided steels was estimated using a Vickers microindentation induced-fracture testing at a constant distance of 25 μm from the surface. The force criterion of fracture toughness was determined from the extent of brittle cracks, both parallel and perpendicular to the surface, originating at the tips of an indenter impression. The fracture toughness values obtained by the Palmqvist crack model are expressed in the form K_C(π/2) > K_C > K_C(0) for the different applied loads and experimental parameters of the bonding process.
机译：本研究表征了AISI 4140钢暴露于糊状硼化工艺的表面。在材料表面上使用4 mm厚的碳化硼浆料层，在1123-1273 K的温度范围内，以不同的曝光时间获得了Fe_2B硬涂层。首先，评估了AISI 4140钢表面硼化物层的生长动力学。其次，使用辉光放电光发射光谱法（GDOES）技术测量了Fe_2B相上合金元素的存在和分布。此外，通过X射线衍射（XRD）分析评估在硼化相上产生的热残余应力。 AISI 4140硼化钢的硼化铁层的断裂韧性是使用维氏显微压痕诱导断裂测试在距表面25微米的恒定距离处估算的。断裂韧性的力标准由平行于和垂直于表面的脆性裂纹的程度确定，该脆性裂纹源于压头压痕的尖端。对于不同的施加载荷和粘结过程的实验参数，通过Palmqvist裂纹模型获得的断裂韧性值表示为K_C（π/ 2）> K_C> K_C（0）。

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  • 来源
    《Applied Surface Science》 |2010年第8期|2372-2379|共8页
  • 作者

    I. Campos-Silva; M. Ortiz-Dominguez; N. Lopez-Perrusquia; A. Meneses-Amador; R. Escobar-Galindo; J. Martinez-Trinidad;

  • 作者单位

    Instituto Politecnico National, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F., 07738, Mexico;

    Instituto Politecnico National, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F., 07738, Mexico;

    Instituto Politecnico National, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F., 07738, Mexico;

    Instituto Politecnico National, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F., 07738, Mexico;

    Instituto de Ciencia de Materiales de Madrid (CSIC), E-28049 Canteblanco, Madrid, Spain;

    Instituto Politecnico National, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F., 07738, Mexico;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    bonding; growth kinetics; characterization; diffusion model; fracture toughness; hard coatings; residual stresses;

    机译：粘接生长动力学;表征;扩散模型断裂韧性硬涂层;残余应力;

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