Tempering and precipitation hardening High speed toolsteels
Tempering and precipitation hardening High speed toolsteels
(OP)
Hello,
First post here so not sure if this is the right place but I'll ask it anyway.
I'm studying about the production of HSS steels. To make HSS steel you austenize the steel to dissolve the alloys (W, Cr, V, Mo) and then quench the steel to give it a martensite structure.
Next the steel goes through a precipitation treatment at ~600°C to give it the red hardness properties. Now in my course notes they say that the microstructure of HSS steel is 'tempered martensite with fine carbide precipitates'. I'm a bit confused between the difference in tempering and precipitation hardening. I know that tempering is to create a less brittle martensite structure by reducing inner stress and precipitation hardening is to let precipitates form in the microstructure for hardening. Now I get the different effect but don't see the difference in treatment? Aren't both heat treatments for prolonged time at a temperature below A1? So am I right if I say that tempering a structure which has alloying elements that are oversaturated and a martensite matrix it will grow precipitates and temper the martensite thus doing tempering and precipitation hardening in one heat treatment?
First post here so not sure if this is the right place but I'll ask it anyway.
I'm studying about the production of HSS steels. To make HSS steel you austenize the steel to dissolve the alloys (W, Cr, V, Mo) and then quench the steel to give it a martensite structure.
Next the steel goes through a precipitation treatment at ~600°C to give it the red hardness properties. Now in my course notes they say that the microstructure of HSS steel is 'tempered martensite with fine carbide precipitates'. I'm a bit confused between the difference in tempering and precipitation hardening. I know that tempering is to create a less brittle martensite structure by reducing inner stress and precipitation hardening is to let precipitates form in the microstructure for hardening. Now I get the different effect but don't see the difference in treatment? Aren't both heat treatments for prolonged time at a temperature below A1? So am I right if I say that tempering a structure which has alloying elements that are oversaturated and a martensite matrix it will grow precipitates and temper the martensite thus doing tempering and precipitation hardening in one heat treatment?





RE: Tempering and precipitation hardening High speed toolsteels
In some of the grades there are two separate treatments involved, it depends on what secondary phases(s) you are wanting to form.
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P.E. Metallurgy, Plymouth Tube
RE: Tempering and precipitation hardening High speed toolsteels
RE: Tempering and precipitation hardening High speed toolsteels
I have provided 2 excellent references below, other than ASM Handbook.
Heat Treatment, Selection, and Application of Tool Steels 2E Second Edition
by William E. Bryson (Author)
https://www.amazon.com/Heat-Treatment-Selection-Ap...
Tool Steels, 5th Edition
Front Cover
George Adam Roberts, Richard Kennedy, G. Krauss
ASM International, 1998 - TECHNOLOGY & ENGINEERING - 364 pages
https://books.google.com.ng/books/about/Tool_Steel...
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: Tempering and precipitation hardening High speed toolsteels
Maui