Abstract
In situ XRD measurements were performed at ESRF, Grenoble, France (ID11) during quenching of a ball bearing steel AISI 52100 (100Cr6) with varying carbon content in solution. The evolution of austenite lattice parameter during cooling is nearly linear until Ms is reached and then, a divergent behavior can be observed. Assuming that the extrapolation of the linear range to room temperature gives the stress-free lattice spacing, an increasing compressive hydrostatic stress state is resulting. A strong effect of the carbon content was found. These results were confirmed by theoretical calculations based on data from the literature.
Highlights
Martensitic transformation in steels has been investigated for more than 100 years [1,2,3].The interest in martensitic transformations is still very high as numerous industrial applications use this transformation to improve wear, mechanical and fatigue properties of parts in engineering components [4]
Several authors describe the residual stress state within retained austenite existing at room temperature as a hydrostatic residual stress state under high compressive stresses [7, 8, 9]
Summary In situ XRD experiments were performed during quenching of a ball bearing steel grade AISI 52100 (100Cr6) after austenitizing at different temperatures leading to varying amount of carbon in solid solution and to changes in the amount of retained austenite
Summary
Martensitic transformation in steels has been investigated for more than 100 years [1,2,3]. Several authors describe the residual stress state within retained austenite existing at room temperature as a hydrostatic residual stress state under high compressive stresses [7, 8, 9]. The reason for this would be the very large volume expansion associated with the martensititic transformation (> 3 Vol %). In situ X-ray diffraction analysis has become a powerful method of materials characterization stimulated by constant advances in instrumentation and data processing This method allows, contrarily to dilatometry or resistivity measurements, to obtain time-resolved quantitative information about every single phase present in the investigated material [10].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
