Prediction of mechanical properties of Fe–Cr–Mo sintered steel in relationship with microstructure

• The contribution deals with the evaluation of required thermodynamic conditions for proper sinteringand prediction of tensile and yield strength of Cr–Mo-pre-alloyed sintered steel. The material used inexperiment was Fe–1.5 Cr–0.2 Mo pre-alloyed water atomised steel powder with addition 0.3–0.7% ofgraphite. Three different sintering routes were used applying sintering at 1180 and 1250 °C for 40 and60 min in 10%H2 + 90%N2 atmosphere of different purity. The influence of sintering conditions on themicrostructure and mechanical properties of sintered Fe–1.5Cr–0.2Mo–(0.3–0.7)C steels is analyzedand mechanical properties are predicted. Results indicate that very accurate prediction of mechanicalproperties can be achieved for sintered steel with bainitic microstructure (higher carbon content) andhigher differences were obtained for ferritic–pearlitic microstructures. High sensitivity of mechanicalproperties on sintering atmosphere purity for chromium prealloyed powder steel was identified.Required sintering atmosphere composition and purity for successful sintering of studied material wereevaluated.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

powder metallurgy

microstructure

particulates and powders

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)