Continuous demand to provide sustainable material solutions for future society is the main driver for our research. Our main aim is to gain knowledge on microstructural features and their influence on the materials performance to design innovative, sustainable, energy-efficient and safe materials. Another goal is to develop NDT practices for efficient quality control and performance evaluation of materials. These provide detailed material know-how to be exploited in real industrial applications.
Research focus and goals
Our research groups research interests are wide-ranging in the area of materials characterization, main focus being on materials microstructural characteristics and their relation on other material properties and on non-destructive material performance evaluation. Research on detailed microstructural characteristics of various materials is based on utilization of multi-scale characterization methods including electron microscopy with microanalysis and electron diffraction techniques and X-ray diffraction analysis. Non-destructive testing enables the examination of a component without affecting to its future use. NDT methods (like magnetic Barkhausen noise and XRD) can be used e.g. for materials surface condition and residual stress evaluation.
Gundgire, T., Jokiaho, T., Santa-aho, S., Rautio, T., Järvenpää, A. & Vippola, M. (2022). Comparative study of additively manufactured and reference 316 L stainless steel samples – Effect of severe shot peening on microstructure and residual stresses. Materials Characterization, 191: 112162. https://doi.org/10.1016/j.matchar.2022.112162
Rautio, T., Jaskari, M., Gundgire, T., Iso-Junno, T., Vippola, M. & Järvenpää, A. (2022). The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel. Materials, 13;15(10): 3517. https://doi.org/10.3390/ma15103517
Honkanen, M., Santa-aho, S., Laurson, L., Eslahi, N., Foi, A., & Vippola, M. (2021). Mimicking Barkhausen noise measurement by in-situ transmission electron microscopy - effect of microstructural steel features on Barkhausen noise. Acta Materialia, 221, . https://doi.org/10.1016/j.actamat.2021.117378
Santa-Aho, S., Kiviluoma, M., Jokiaho, T., Gundgire, T., Honkanen, M., Lindgren, M., & Vippola, M. (2021). Additive manufactured 316l stainless-steel samples: Microstructure, residual stress and corrosion characteristics after post-processing. Metals, 11(2), . https://doi.org/10.3390/met11020182
Jokiaho, T., Santa-aho, S., Peura, P., & Vippola, M. (2020). Cracking and Failure Characteristics of Flame Cut Thick Steel Plates. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 51, 1744-1754. https://doi.org/10.1007/s11661-020-05639-x
Santa-aho, S., Sorsa, A., Honkanen, M., & Vippola, M. (2020). Detailed Barkhausen noise and microscopy characterization of Jominy end-quench test sample of CF53 steel. Journal of Materials Science, 55(11), 4896-4909. https://doi.org/10.1007/s10853-019-04284-z
Tomkowski, R., Sorsa, A., Santa-Aho, S., Lundin, P., & Vippola, M. (2019). Statistical evaluation of barkhausen noise testing (BNT) for ground samples. Sensors (Switzerland), 19(21), . https://doi.org/10.3390/s19214716
Sorsa, A., Santa-aho, S., Aylott, C., Shaw, B., Vippola, M., & Leiviskä, K. (2019). Case Depth Prediction of Nitrided Samples with Barkhausen Noise Measurement. Metals, 9(3), . https://doi.org/10.3390/met9030325
Jokiaho, T., Santa-aho, S., Peura, P., & Vippola, M. (2019). Role of Steel Plate Thickness on the Residual Stress Formation and Cracking Behavior During Flame Cutting. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 50(9), 4178–4192. https://doi.org/10.1007/s11661-019-05314-w