S. Riesenbeck, T. Gädicke, and A. Neidel (2015). Metallurgical Failure Investigation of Quench Cracking in Hexagonal Bolt Head Fasteners. Practical Metallography: Vol. 52, No. 5, pp. 270-280. doi: 10.3139/147.110256 © Carl Hanser Verlag GmbH & Co. KG ISSN 0032-678X