PSI - Issue 69
Pekka Kantanen et al. / Procedia Structural Integrity 69 (2025) 53–60
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corresponding values of the IAT 650 °C material. Strain-induced martensite transformation during punching, driven by high strain localization close to the resulting cut edge, was identified as the primary contributor to increased hardness in punched materials. The observed RA fraction varied significantly between the tensile and punching conditions, highlighting the role of degree of strain localization for the remaining RA fraction in the deformation areas after the testing. In future studies, effects of different RA morphologies and distributions on the strain-induced martensite transformation during the punching process should be investigated more in-detail. Acknowledgements The authors are grateful for financial assistance of the Business Finland research project FOSSA2 – Fossil-Free Steel Applications: Phase II. The authors would also like to thank Jane and Aatos Erkon säätiö (JAES) and Tiina ja Antti Herlinin säätiö (TAHS) for their financial support on Advanced Steels for Green Planet Project (AS4G). References [1] Magalhães, A., Moutinho, I., Oliveira, I., Ferreira, A., Alves, D., and Santos, D., 2017. Ultrafinegrained microstructure in a medium manganese steel after warm rolling without intercritical annealing. ISIJ International 57, 1121–1128. [2] Soleimani, M., Kalhor, A., and Mirzadeh, H., 2020. Transformation-induced plasticity (TRIP) in advanced steels: A review. Materials Science and Engineering A 795, 140023. [3] Zhang, Y., Wang, L., Findley, K.O., and Speer, J. G., 2017. Influence of Temperature and Grain Size on Austenite Stability in Medium Manganese Steels. Metallurgical and Materials Transactions A 48, 2140–2149. [4] Lee, S., Lee, S.J., and De Cooman, B.C., 2011. Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel. Acta Materialia 59, 7546–7553. [5] Plosila, P., Kantanen P., Hannula J., Javaheri V., Kömi J., and Kaijalainen A., 2024. Hole expansion performance of a medium manganese advanced high-strength steel after hot rolling and intercritical annealing. Materials Research Proceedings 44, 358–367. [6] Kantanen, P., Anttila, S., Karjalainen, P., Latypova, R., Somani, M., Kaijalainen, A., and Kömi, J., 2022. Microstructures and mechanical properties of three medium-Mn steels processed via quenching and partitioning as well as austenite reversion heat treatments. Materials Science and Engineering: A 847, 143341. [7] Kantanen, P., Javaheri, V., Somani, M., Porter, D., and Kömi, J., 2021. Effect of deformation and grain size on austenite decomposition during quenching and partitioning of (high) silicon-aluminum steels. Materials Characterization 171, 110793. [8] Chiang, J., Lawrence, B., Boyd, J.D., and Pilkey, A.K., 2011. Effect of microstructure on retained austenite stability and work hardening of TRIP steels. Materials Science and Engineering: A 528, 4516–4521. [9] Yang, Y.G., Mi, Z.L., Xu, M., Xiu, Q., Li, J., and Jiang, H. T., 2018. Impact of intercritical annealing temperature and strain state on mechanical stability of retained austenite in medium Mn steel. Materials Science and Engineering: A 725, 389–397. [10] Jiménez, J. A., Carsí, M., Ruano, O.A., and Frommeyer, G., 2008. Effect of testing temperature and strain rate on the transformation behaviour of retained austenite in low-alloyed multiphase steel. Materials Science and Engineering: A 508, 195–199.
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