Heat treatment giving a stable high temperature micro-structure in cast austenitic stainless steel

Patent · Tue Apr 12 04:00:00 EDT 1988

OSTI ID:5002925

Anton, D L; Lemkey, F D

A heat-treated cast austenitic stainless steel alloy consisting essentially of about 13-17% chromium, about 13-17% manganese, about 1.5-2.5% molybdenum, about 1.0-2.0% carbon, about 0.5-15% niobium, about 0.5-1.5% silicon, with the balance being iron is described which is produced by the process comprising: casting the alloy; subjecting the alloy to a prebraze heat cycle treatment including heat treating the cast alloy at about 735/sup 0/-785/sup 0/C for about 18-22 hours followed by cooling; and subjecting the alloy to a braze cycle heat treatment including: a first stage heat treatment at about 1040/sup 0/-1090/sup 0/C for about 20-40 minutes followed by cooling; an optional second stage heat treatment at about 765/sup 0/-815/sup 0/C for about 14-18 hours followed by cooling; an optional third stage heat treatment at about 625/sup 0/-675/sup 0/C for about 14-18 hours followed by cooling.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4737204
• OSTI ID: 5002925
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
AUSTENITIC STEELS
CARBON COMPOUNDS
CASTING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COOLING
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
EXTRACTIVE METALLURGY
FABRICATION
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
MANGANESE ALLOYS
METALLURGY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SILICON COMPOUNDS
STAINLESS STEELS
STEELS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE