Low Temperature Creep Behavior of PM Components Under Static Load Conditions
Paper i proceeding, 2013

Increasing demand on PM steels for automotive applications necessitates high performance structural components with good tolerances and mechanical properties. However, it has been found that some sinter parts lack dimensional stability due to unexpected creep or relaxation under high and prolonged static loading conditions. The present investigation deals with the low temperature creep behavior of sintered steel grade Distaloy HP under high static loading conditions. Experiments were therefore performed on sinter-hardened and subsequently tempered standard tensile specimens, involving the comparison of effect of tempering at 200 and 300°C. When having constant load of 20 kN, equivalent to stress level of almost 90% of the yield stress, tempering as such and higher tempering temperature in particular lowered the creep response or relaxation when testing at slightly elevated temperatures of minimum 90-100C. Hence, proper tempering can reduce the dimensional instability otherwise experienced for the studied PM steel at high static loads applied for long periods of time.

Distaloy HP

low temperature creep

dimensional stability

tempering

sintered steels

Författare

Kumar Babu Surreddi

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Maheswaran Vattur Sundaram

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Henrik Karlsson

Volvo Group

Michael Andersson

Höganäs

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Proceedings of Euro PM2013

Vol. 3 349-354

Sinterprodukter med hög statisk lastförmåga - inverkan av anlöpning på deformationsstabilitet vid användning

VINNOVA, 2012-10-01 -- 2013-09-30.

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2018-09-26