Effect of specimen preparation on contact fatigue wear resistance of austempered ductile cast iron

Brunetti, Cristiano; Leite, Mario Vitor; Pintaúde, Giuseppe

doi:10.1016/j.wear.2007.01.078

Cited by 28 publications

(20 citation statements)

References 7 publications

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“…In the polished samples, the presence of surface nodules can be noticed while in the ground samples, nodules at the surface cannot be seen. According to a previous study, 32) this feature is ascribed to the plastic deformation of the metallic matrix, inherent to abrasive cutting of grinding, which covers the nodules. Figure 5 compares the Ra and Rsk values of the uncoated and coted samples.…”

Section: Sliding Wear Testsmentioning

confidence: 88%

Sliding Wear Behavior of PVD CrN and TiN Coated Austempered Ductile Iron

et al. 2014

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This work studies the sliding wear behavior of PVD coated austempered ductile iron samples. The effects of the substrate surface finishing method (grinding and polishing) and coating material (CrN and TiN) on the wear behavior are evaluated. Coatings were applied in an industrial reactor. Deposition times were adjusted to obtain similar film thicknesses in both coating materials. Wear tests under dry sliding conditions were carried out with a pin-on-disc tribometer (ASTM G99). The steady-state friction coefficient and wear rate were calculated for each sample variant. The wear track of the discs was examined by using optical microscopy and stylus profilometry.The results obtained indicate that the uncoated and TiN coated samples show steady-state friction coefficients close to 0.8, while the CrN coated samples show steady-state values close to 0.4. The sliding wear tests do not produce the fracture and/or delamination of the films in any case. The specific wear rate of the CrN and TiN coated samples is close to zero, while that of the uncoated samples is higher. The wear rate of the uncoated samples is slightly higher for the ground ones. The specific wear rate of the pins (AISI 52100 bearing balls) is higher than that of the discs in all the cases. The wear rate of the pins tested against uncoated samples is higher for the ground ones. The wear rate of the pins tested against coated samples is higher for the polished and TiN coated ones.

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Section: Sliding Wear Testsmentioning

confidence: 88%

Sliding Wear Behavior of PVD CrN and TiN Coated Austempered Ductile Iron

et al. 2014

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“…为概率疲劳 P-C-S-N 曲线。大量的试验统计分析表明，上述概率曲线模型主要适用于应力疲劳领域。在滚动接触疲劳领域， Weibull 分布被认为更适合用来描述疲劳寿命的统计特征。TALLIAN [8][9] 较早证实了 Weibull 分布是描述滚动接触疲劳寿命的良好统计分布， BRUNETTI 等 [10][11][12][13][14] 也先后应用 Weibull 分布开展了若干滚动接触疲劳试验及模拟数据的分析。但现有工作一般局限于一定试验接触应力幅(S ca )水平下的单组疲劳寿命数据 [8][9][10][11][12][13] ，要应用于变幅及应力谱下的分析评价，尚需要发展考虑 S ca -N 关系的概率疲劳 S ca -N 曲线模型。SHIMIZU 等 [14] 以存活概率 0.9 下的寿命为基础，建立了确定…”

Section: 计模型，考虑分散性规律和误差风险，确定存活概率(P)、置信度(c)相关的 S-n 关系模型，通常称之unclassified

Modeling of the Probabilistic Fatigue S-N Curves Using the Two Parameter Weibull Distribution

Zhao¹

2015

JME

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Abstract： Modeling and construction method of the probabilistic fatigue S-N curves are developed using the two parameter Weibull distribution for describing random rolling contact fatigue stress amplitude-life relations. Except for the statistical distributed regularities of the random relations, a least norm life confidence bound assessment is incorporated into the modeling for considering risk effect related to limited sampling size. The scale and shape parameters of the distribution, the statistical parameter for the confidence assessment, and the exponents of the S-N curves are all determined by the test data set. Applicability of the present method has been well verified by treating the rolling contact fatigue test S-N data of G20CrNi2Mo bearing steel. In addition, a skew statistical model is proved to be suitable for characterizing the statistical distributed regularities of the rolling contact fatigue life data.

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“…Several authors have studied the RCF behavior of ADI [6][7][8][9][10], finding that its sensitivity to damage increases as austempering temperature and holding time decrease and as nodule count increases, and that surface and subsurface graphite nodules act as preferential sites for crack nucleation. The influence of specimen preparation on the RCF behavior of ADI has also been studied [11], finding that a polishing with 1 µm diamond grains after grinding process led to a decrease of surface roughness and an increase in RCF life. Other authors have studied the effects of different surface treatments [12,13], finding that a laser hardening, which induced a near surface structure transformation, increased the RCF life of ADI and that a shot peening, which induced compressive residual stresses but also increased surface roughness, was not beneficial.…”

Section: Introductionmentioning

confidence: 99%