Considerable changes occurred after the hardening step: uniformlydistributed fine precipitates of intermediate phases have formed in the martensitic structure
The contributions of hardening mechanisms in the martensitic structure
include the solid solution substitution element hardening, the precipitation hardening, the primary austenitic grain size hardening and the martensite morphology hardening.
The registered condition of the initial microstructure suggested that this case was the final condition of the chip as the martensitic structure
mentioned above showed no subsequent plastic deformation.
As emphasized in the theoretical section, the connection between a single variant of martensite and the parent austenitic phase is provided by a twinned martensitic structure
, which is able to satisfy the compatibility conditions both with the austenite (over the habit plane) and with the single variant.
Extendo-Die hot work die steel, with a fully martensitic structure
, has superior wear resistance and toughness when compared with H-13 tool steel, especially in large sections heavier than 3[inches] to 4[inches].
Ni-Mo steel can be cured by a simple heat treatment which leads to a new material structure: the martensitic structure
Tempering of the martensitic structure
at approximately 620 deg C leads to the reformation of the finely dispersed austenitic structure.
When these materials are heated the martensitic structure
is changed into austenitic structure.
Microstructural examination of the failed sleeve revealed a coarse tempered martensitic structure
Alternatively, the martensitic structure
may be produced and immediately tempered by the residual heat.
500 41 to 47 RC) hardness with martensitic structure
The wear is smaller when the steel has a martensitic structure