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Crack susceptibility of medium and high alloyed tool steels under continuous casting conditions
Author(s) -
Flesch Roman,
Bleck Wolfgang
Publication year - 1998
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199805552
Subject(s) - materials science , metallurgy , liquidus , ductility (earth science) , embrittlement , carbide , casting , ultimate tensile strength , atmospheric temperature range , alloy , creep , physics , meteorology
Hot tensile tests after partial melting of the specimens were carried out on medium and high alloyed tool steels and their mechanical properties (maximum force and reduction of area) were determined in the temperature range between liquidus and 900°C. Cooling conditions and strain rates were varied in this range. The temperature ranges of reduced ductility were determined, the metallurgical reasons for embrittlement were investigated by means of metallographic and microprobe analysis. The crack susceptibility is related to an enrich‐ment of carbon and carbide forming elements in cold and hot working steels, and to the high S content in the segregated zone of the laminate forming steels. The crack susceptibility can be minimized by low strain rates combined with a strong secondary cooling.