ISSN:
1573-8973
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. Disappearance of excess point defects in heat-resistant nickel alloy KhN65VMTYu begins with heating to 100° and ends at ∼250°. 2. A substantial change in the polygonal structure is observed with heating to 750–850°. Improvement of the intragranular structure continues in the process of secondary recrystallization — up to 1160–1180°. 3. Primary recrystallization begins at 900–950° and ends at 980–1020°, depending on the extent of preliminary cold working. 4. The temperature dependence of secondary recrystallization depends to a considerable extent on the temperature at which dispersed phases go into solution. The rate of secondary recrystallization obeys a parabolic rule. Increasing the temperature and the extent of hot deformation slightly increases the susceptibility to secondary recrystallization. The optimal recrystallization annealing treatment for the OA heat is 1180° for 2–3 h, and 1160° for 2–3 h for the OI heat. 5. Differences in grain size in microvolumes with ε 〉 εcr are affected mainly by uneven distribution of dispersed phases. 6. Lowering the forging temperature leads to quite uneven deformation through the bulk of the forging and substantial differences in grain size in macrovolumes; the optimal final forging temperature is 1160°.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00780776
Permalink