Torque-related lamellar carbide growth associated with annealing twins in 304 stainless steel

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)00282-M· OSTI ID:27881

Romero, R J; Murr, L E ^[1]

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1. Univ. of Texas, El Paso, TX (United States)

A configurational, equilibrium theory for relative interfacial torques has been invoked to qualitatively explain growth-specific lamellar precipitation of M{sub 23}C{sub 6} carbides in 304 stainless steel where the lamellar growth is always in the <112> directions coincident with traces of {l_brace}111{r_brace} planes at 90{degree} to (110) grain surface orientations. For (112) grain surface orientations, M{sub 23}C{sub 6} lamellar growth is always in the [1{bar 1}0] direction which is also coincident with traces of (11{bar 1}) plans at 90{degree} to the grain surface plane. These {l_brace}111{r_brace} trace directions for lamellar growth are denoted T90 directions and are shown to coincide with high, relative interfacial torques (or torque configurations) resolved in coherent {l_brace}111{r_brace} annealing twin boundaries. For grain surface orientations containing annealing twins or twin/grain boundary geometries whose coherent {l_brace}111{r_brace} boundaries are not coincident with T90 directions, such as (100), there are no high-torque configurations and no significant lamellar M{sub 23}C{sub 6} growth coincident with {l_brace}111{r_brace} trace directions.

• OSTI ID: 27881
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 2 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ANNEALING
GRAIN BOUNDARIES
INTERFACES
MICROSTRUCTURE
NUCLEATION
PRECIPITATION
STAINLESS STEEL-304
TWINNING