The determination of advanced heat treatment parameters of the forged tongue profile rails made of R30HT steel
Source abstract
Abstract
The study aimed to determine the effect of heat treatment on the properties and microstructure of forged tongue rails. This was accomplished by comparing a forged rail previously only air-cooled with one heat-treated to 905 °C and then cooled at 3.08 °C/s. Mathematical modelling of the forging process was conducted, revealing the areas of greatest and least deformation. The forged rail was divided into three areas: the first, where the rail was completely forged – Q1, the second range partially forged – Q2, and the third range with an initial profile not deformed – Q3. After heat treatment in the Q1 and Q2 areas, the greatest increase in hardness is observed, reaching about 375 HBW. In the area Q3, where the material was only heated before forging and not deformed, the increase of the interlamellar distance of pearlite and ferrite precipitates at the pearlite grain boundaries was observed. Therefore, heat treatment was only allowed to raise the hardness in Q3 to about 325 HBW. This area is the weakest part of the rails. Based on the results of the collected research, the cooling rate was proposed in the range of 3 – 5 ° C/s on the surface of the head of the forging zone, while for the non-forging range in the range of 5 – 6 ° C/s.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Railway Systems and Materials Science · Metal Alloys Wear and Properties · Materials Engineering and Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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