ASM Handbooks are good research resources. They can be used to find material properties and data tables about different materials. Search for the topics of high-hardness steel and cold cracking.
The top results are chapters from the online handbooks called Steel Heat Treating Fundamentals and Processes (ASM Handbook Volume 4A) and Steel Heat Treating Technologies (ASM Handbook Volume 4B).
These can be searched and browsed further for additional information on working with all types of steel.
Check out the ASM Handbook Volume 6, Welding, Brazing, and Soldering (https://doi.org/10.31399/asm.hb.v06.9781627081733).
Try another search: jominy quench AND plate samples