2005
DOI: 10.2320/matertrans.46.1779
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Tempering Treatment Effect on Mechanical Properties of F82H Steel Doped with Boron and Nitrogen

Abstract: Effects of tempering treatment on mechanical properties and microstructures have been studied for martensitic steel F82H doped with 60 ppm B and 200 ppm N (F82H þ B þ N). The tempering treatments were performed at 700-780 C after the normalizing treatment at 1000 C. Yield stress of the F82H þ B þ N steel tempered at 700, 750 and 780 C was 740, 580 and 500 MPa, respectively, and ductile-brittle transition temperature (DBTT) of the specimens was À55, À85 and À85 C, respectively. The areal density of dislocations… Show more

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“…The second normalizing was performed to reduce grain sizes and to transfer boron atoms from carbides to BN, and the second tempering was also performed to trap free boron atoms in matrix into carbides. The distributions of boron, boron nitride and oxygen were measured by a secondary ion mass spectrometry (SIMS) in a previous work [18,19], and the uniformly distribution of boron was observed in the specimen. The ductile-brittle transition temperature of the specimens was measured by Charpy impact tests.…”
Section: Methodsmentioning
confidence: 99%
“…The second normalizing was performed to reduce grain sizes and to transfer boron atoms from carbides to BN, and the second tempering was also performed to trap free boron atoms in matrix into carbides. The distributions of boron, boron nitride and oxygen were measured by a secondary ion mass spectrometry (SIMS) in a previous work [18,19], and the uniformly distribution of boron was observed in the specimen. The ductile-brittle transition temperature of the specimens was measured by Charpy impact tests.…”
Section: Methodsmentioning
confidence: 99%