B. Fischer and E. Cagliyan (2016). Metallurgical Failure Investigation of a Surface Hardened Drive Shaft Made of Tempered Low-Alloy Steel 25CrMo4 (1.7218) Practical Metallography: Vol. 53, No. 9, pp. 592-598. doi: 10.3139/147.110395 © Carl Hanser Verlag GmbH & Co. KG ISSN 0032-678X