THE STRENGTH OF NICKEL AT ROOM TEMPERATURE AND AT HIGH TEMPERATURES AS AFFECTED BY THE PARTICULAR STRUCTURAL STATE WHICH OCCURS DURING A HIGH-TEMPERATURE THERMO-MECHANICAL TREATMENT

Journal Article · Fri Jun 01 04:00:00 EDT 1962 · Doklady Akad. Nauk S.S.S.R.

OSTI ID:4767616

Lozinskii, M G; Antipova, E I; Assonova, E A; Nikitina, I I

Austenitic alloys can be strengthened by a hightemperature thermomechanical treatment'' (HTT) which consists of the following: holding at a high-temperature to obtain a homogeneous solid solution (about 1200 deg C for most austenitic alloys and high-heat-strength alloys); cooling to 900-1100 deg C in treating a steel alloy, and to 500 to 900 deg C in strengthening nickel. plastic deformation with a reduction of about 25 to 35%; cooling to fix the specific structural state formed during the hot plastic deformation; and dispersion hardening or aging by precipitation of a carbide or intermetallic compound. The control samples were cooled directly from 1200 deg C by plunging in water. Microstructural photographs of technical-grade nickel subjected to high-temperature (900 deg C) hot rolling at 6.7 m/min show that the grain boundaries are more saw-toothed'' as compared to the control samples. The structure of the treated sample hinders the propagation of cracks. In testing the long-term strength of the nickel samples, a stress sigma = 31.2 kg/mm/sup 2/ was used at400 deg C, and sigma = 10 kg/mm/sup 2/ was used at 600 deg C. The time for failure of the treated sample as compared to the control sample was greater by a factor of 118 at 600 deg C, 19 at 700 deg C, 18 at 800 deg C, and 12 at 900 deg C. A 43 to 63% increase in yield strength is observed with a thermal treatment of the sample at 600 deg C. As compared to the controls, the treated nickel samples showed an increase in the yield point of 134 to 203% at 400 deg C, and of 195 to 256% at 600 deg hot rolling. The thermal treatment increases the strength of the nickel and improves its plastic properties. (TTT).

• Research Organization: Maschine Inst. of the Government Committee of the Council of Ministers on Automation and Machine Building, USSR
• NSA Number: NSA-16-030819
• OSTI ID: 4767616
• Journal Information: Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 144
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

AUSTENITE
CARBIDES
CONFIGURATION
CONTROL
COOLING
CRACKS
DISPERSIONS
DUCTILITY
FAILURES
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
HOT WORKING
INTERMETALLIC COMPOUNDS
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL
PHOTOGRAPHY
PRECIPITATION
ROLLING
SAMPLING
SOLID SOLUTIONS
STEELS
STRESSES
TEMPERATURE
TENSILE PROPERTIES
THERMODYNAMICS
WATER