- author = "Bojan Podgornik and Vojteh Leskovsek and Miha Kovacic and Josef Vizintin",
- title = "Residual Stress Field Analysis and Prediction in Nitrided Tool Steel",
- journal = "Materials and Manufacturing Processes",
- year = "2011",
- volume = "26",
- number = "9",
- pages = "1097--1103",
- keywords = "genetic algorithms, genetic programming, Forming, Microhardness, Nitriding, Residual, Stresses, Tools",
- ISSN = "1042-6914",
-
URL = "
http://www.tandfonline.com/doi/abs/10.1080/10426914.2010.525573",
-
DOI = "
doi:10.1080/10426914.2010.525573",
-
abstract = "Residual stresses are present in engineering
components as an unintended consequence of
manufacturing processes, but they are also deliberately
introduced to beneficial effect during surface
engineering procedures. Plasma nitriding is a process
of particular importance for forming tools and dies,
giving significant advantages in wear, and fatigue
resistance through the generation of near-surface
compressive residual stresses. A precise knowledge of
the level and distribution of residual stresses that
exist in engineering components is necessary for an
accurate design and prediction of a component's fatigue
resistance. However, measurement of residual stresses
is not always possible, which is especially true for
forming tools. Therefore, other methods for residual
stress evaluation and prediction are required.
Results of this investigation show that residual stress level and depth in plasma nitrided tool steel increase with nitriding time and temperature. On the other hand, experimental data indicates that the residual stress distribution in plasma nitrided tool steels can be determined on the basis of microhardness depth distribution. A minimum in the microhardness depth profile derived over depth corresponds to the location of the compressive residual stress maximum. Furthermore, the residual stress level can be extrapolated by using reference residual stress data and genetic programming. In this way the residual stress level and distribution can be obtained even for components where measurement is not possible.",
