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. Reduction of the cooling rate from austenitization temperature (VCOO) leads to a reduction in the hardness of the 15Kh2N3MDFTChA steel in unannealed state. The dependence of HRC=f(VCOO) in annealed state is of an extremal nature with the hardness maximum moving towards lower VCOO with rising annealing temperatures. 2. The 15Kh2N3MDFTChA steel has the lowest crack resistance after annealing. The steel hardened to a structure of martensite+lower bainite after medium and high annealing is with regard to hardenss and crack resistance practically no worse than a steel with a martensite structure. 3. The dependence of mechanical characteristics of hardened as well as of normalized steel 15Kh2N3MDFTChA on the duration of low annealing is of a pulsating character caused by the processes of formation, coagulation, and dissolution of metastable carbides of three types. 4. In the low-annealed condition after tann〉6 the normalized 15Kh2N3MDFTChA steel with an initial martenisite-bainite structure has an advantage over a steel hardened for martenisite with regard to crack resistance both after single as well as after cyclic loading without being less hard. 5. The maximum level of crack resistance of the low-annealed 15Kh2N3MDFTChA steel (both the normalized and the hardened) under single or cyclic loading is reached at tann=15 and 35 h, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00777817
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