Influence of tempering temperature on stability of carbide phases in 2. 6Cr-0. 7Mo-0. 3V steel with various carbon content

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

OSTI ID:5228431

Janovec, J; Vyrostkova, A ^[1]; Svoboda, M ^[2]

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1. Slovak Academy of Sciences, Watsonova (Slovenia). Inst. of Materials Research
2. Academy of Sciences of the Czech Republic, Zizkova (Czechoslovakia). Inst. of Physical Metallurgy

The present work evaluates the influence of the bulk carbon content (0.1, 0.006, and 0.005 wt pct) and tempering temperature (823, 853, and 913 K) on stability, chemical composition, and size of carbide particles in 540 ks tempered states of 2.6Cr-0.7Mo-0.3V steel. The scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDXS) and electron diffraction methods were used to analyze the carbide particles. A characteristic energy-dispersive X-ray (EDX) spectrum can be attributed to each of the identified carbides. The MC carbide is stable in all experimental states. The phase stability of Fe-Cr-rich carbides increased in the order [epsilon], Fe[sub 3]C [r arrow] M[sub 3]C [r arrow] M[sub 7]C[sub 3], with tempering temperature increasing. In steels with higher carbon content tempered at low temperature, M[sub 23]C[sub 6] carbide was also noted. The Mo[sub 2]C and M[sub 6]C carbides were not observed. It was shown that the decrease of the bulk carbon content has the same influence on the carbide phases stability as the increase of the bulk vanadium content at the unchanged Cr, Mo, C bulk contents and tempering temperature. Similarly, the decrease of tempering temperature has the same influence on the carbide phases stability as the decrease of the bulk Cr content at the unchanged V, Mo, and C bulk contents.

• OSTI ID: 5228431
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 25:2; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
METALLURGICAL EFFECTS
CHROMIUM-MOLYBDENUM STEELS
PHASE STUDIES
LOW ALLOY STEELS
EXPERIMENTAL DATA
TEMPERATURE DEPENDENCE
ALLOYS
DATA
ELEMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
NONMETALS
NUMERICAL DATA
STEELS
360102* - Metals & Alloys- Structure & Phase Studies