Microstructure and properties of a P/M high-chromium-iron alloy

Conference · Sun Jan 01 00:00:00 EST 1984 · Prog. Powder Metall.; (United States)

OSTI ID:5138504

Mohan, S; Lawley, A; Woodyatt, L R; Brosius, K S

Microstructure-property relationships have been developed for a powder processed high chromium iron alloy (Fe- 20% Cr- 1.5% Mo- 2.5% C), with particular interest vested in the possible effects of rapid solidification of the powder on final properties. The alloy was gas atomized, screened into three size fractions (119 to 213 ..mu..m; 74 to 107 ..mu..m; less than or equal to 44 ..mu..m), hot isostatically pressed (HIPed) to full density, and heat-treated (HT) to give a structure consisting of M/sub 7/C/sub 3/ carbides in tempered martensite. Microstructures were characterized in the powder form, after HIPing and HIP + HT. Properties evaluated were not hardness, hot compressive strength, fracture toughness and abrasive and adhesive wear. Comparisons were made with a chill cast alloy of similar composition. Each of the above properties was relatively insensitive to powder particle size. The strength and temperature dependence of strength of the powder-processed and cast forms were similar but there were significant differences in fracture toughness and wear resistance between the powder-processed and cast forms of the alloy. The level of fracture toughness in the powder metallurgy material was significantly lower than that of the cast material. In terms of abrasive wear, the powder-processed material was inferior to the cast material at low stress levels but was comparable at high stress levels. Resistance to adhesive wear was superior in the powder-processed material compared to the cast material. These property differences have been analyzed and interpreted in terms of the nature, scale and morphology of the associated microstructures.

• Research Organization: Plasma Technology, Inc., Torrance, CA
• OSTI ID: 5138504
• Report Number(s): CONF-8305226-
• Journal Information: Prog. Powder Metall.; (United States), Vol. 39; Conference: Annual powder metallurgy conference, New Orleans, LA, USA, 1 May 1983
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
MECHANICAL PROPERTIES
MICROSTRUCTURE
CHROMIUM ALLOYS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
MICROHARDNESS
POWDER METALLURGY
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
HARDNESS
IRON ALLOYS
METALLURGY
NONMETALS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties