The heat treatment of St-2 was normalization (austenitizing
at 870[degrees]C, temperature 30-50[degrees]C higher than austenitizing
temperature and air cooling to room).
In order to prevent formation of fine new cementite lamellae, the austenitizing
time was reduced to 15 seconds (H15-1).
In some cases, particularly involving hardening temperatures over 2000F, multiple preheating steps may be used prior to reaching the final austenitizing
The castings are heat treated per the ASTM A958 specification (1,700F austenitizing
, water quench and 1,150F temper cycle).
Transformation characteristics of ductile iron austempered from intercritical austenitizing
Variable parameters include austenitizing
temperature, grain size and lowest volume fraction percentage of the phase detected.
, care must be taken to avoid carburization or decarburization by carefully monitoring the heat-treating atmosphere.
The section size and chemical composition of the casting will determine the time and temperature for austenitizing
HT *-heat treated rail that has undergone accelerated cooling from austenitizing
temperature during the metallurgical transformation period.
In the 1930s, a fine, feathery, needle-like microstructure unlike ferrite, pearlite and martensite was found in steels when they were cooled rapidly from austenitizing
temperatures and held at intermittent temperatures.
The Effect Of Cooling Rate From The Austenitizing
Temperature On The Thermal Fatigue Cracking, Microstructure And Impact Resistance Of H13 Die Material (T05-041)
0025% B and the austenitizing
temperature on the asquenched hardness of a 0.
explained the advantages of austenitizing
gray iron to improve wear and damping characteristics.
Kovacs related the accoustical properties of ADI to yield strength, tensile strength, elongation and density as a function of the austenitizing
and austempering temperatures.
For example, Kovacssaid, a shorter-than-optimum austenitizing
time causes the formation of metastable and/or unstable austenite, which can result in stressing the part during machining.