Influence of processing parameters on the fatigue life time of specimens made from quenched and tempered steel SAE 4140H
Influence of processing parameters on the fatigue life time of specimens made from quenched and tempered steel SAE 4140H
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DOI：
10.3139/120.111391
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发表时间：
2019-08
影响因子：
2.5
通讯作者：
Fabian Weber;R. Acosta;Tina Eyrisch;Torsten Hielscher;M. Magin;P. Starke
中科院分区：
文献类型：
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作者：
Fabian Weber;R. Acosta;Tina Eyrisch;Torsten Hielscher;M. Magin;P. Starke
对高应力部件的要求不断增加。因此，为了与金属部件竞争，需要具有更高效率的部件。因此，全面了解金属材料和构件的疲劳行为以及开发可靠计算使用寿命的新方法越来越重要。构件的疲劳特性是多参数集，并且受到表面完整性的强烈影响，因为表面和近表面区域是构件的最大应力区域。表面完整性受每个单独的制造过程、其参数、过程顺序和过程组合的影响。由于其高度的复杂性，过程链的影响-原因-结果关系尚未得到充分的理解。为了分析制造工艺链之间的相互作用，它们的设计，材料特性的变化，特别是微观结构和由此产生的组件特性，试样进行了处理，特别是不同的加工参数和抛光表面。通过X射线残余应力测量、物相分析、共聚焦显微镜表面形貌分析等方法对试样进行了表征。这些分析的结果被用作半经验模型和有限元分析的输入，提供有效的应力幅，包括应力集中和残余应力等因素，以预测它们对疲劳寿命的影响。这种额外的材料信息可以用于当前现有的短时程序或用于常规确定的SN曲线，以将其扩展到多参数数据集。在本文范围内提出的调查进行的标本由调质钢SAE 4140 H（42 CrMoS 4）加工与各种工艺参数。
Abstract The demands placed on highly stressed components are constantly increasing. For this reason, components with a higher degree of efficiency are required for the competitiveness of metallic components. Therefore, a comprehensive understanding of the fatigue behavior of metallic materials and components as well as the development of new methods for the reliable calculation of service life are of increasing importance. The fatigue properties of components are multi-parameter sets and are strongly influenced by surface integrity, as surface and near-surface zones are the most stressed regions of a component. Surface integrity is influenced by each individual manufacturing process, its parameters, the process order and the process combination. Due to their high complexity, the influence-cause-effect relationships of process chains have not yet been sufficiently understood. In order to analyze the interactions between manufacturing process chains, their design, variations in material properties, in particular the microstructure and the resulting component properties, specimens were processed with specifically different machining parameters with and without polished surface. The specimens were characterized by different analyzing methods, such as X-ray for residual stress measurements and phase analysis as well as surface characterizations through confocal microscopy. The results from these analytics are used as an input for a semi-empirical model and finite element analysis providing effective stress amplitudes which include factors such as stress concentration and residual stress in order to predict their influence on fatigue life. This additional material information can be used in currently existing short-time procedures or for conventional determined SN curves to expand them to a multi-parameter dataset. The investigations presented in the scope of this paper were performed on specimens made from quenched and tempered steel SAE 4140H (42CrMoS4) machined with various processing parameters.