HEAT TREATMENT OF CLOSED-DIE FORGINGS OF LOW-ALLOY AHSS STEELS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F18%3A43952999" target="_blank" >RIV/49777513:23210/18:43952999 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.daaam.info/Downloads/Pdfs/proceedings/proceedings_2018/103.pdf" target="_blank" >http://www.daaam.info/Downloads/Pdfs/proceedings/proceedings_2018/103.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2507/29th.daaam.proceedings.103" target="_blank" >10.2507/29th.daaam.proceedings.103</a>

Jazyk výsledku

angličtina

Název v původním jazyce

HEAT TREATMENT OF CLOSED-DIE FORGINGS OF LOW-ALLOY AHSS STEELS

Popis výsledku v původním jazyce

New methods are sought today for improving the mechanical properties of heavy-duty parts of high-strength steels, particularly in the automotive industry. AHS steels tend to be associated with high strength and hardness, which are achieved at the cost of poor ductility. Nevertheless, ductility can be improved: by alloying or by creating an additional phase through heat treatment. In the present study, this phase was retained austenite which, if present in a stable condition in a martensitic matrix, improves the material’s ductility. The experimental steel was specially alloyed in order to depress the Ms and Mf temperatures. It contained 2.5% manganese, 2.09% silicon and 1.34% chromium, with additions of nickel and molybdenum. An actual closed-die forged part was made of this steel. This forged part was then fitted with thermocouples attached to its surface and in its interior and treated using the Q&amp;P process. The Q&amp;P process is an innovative heat treatment procedure. It is characterized by rapid cooling from the soaking temperature to a quenching temperature between the Ms and Mf. Subsequent reheating and holding at a partitioning temperature stabilizes retained austenite in martensitic matrix. Cooling was performed in boiling water and then in still air without tempering.

Název v anglickém jazyce

HEAT TREATMENT OF CLOSED-DIE FORGINGS OF LOW-ALLOY AHSS STEELS

Popis výsledku anglicky

New methods are sought today for improving the mechanical properties of heavy-duty parts of high-strength steels, particularly in the automotive industry. AHS steels tend to be associated with high strength and hardness, which are achieved at the cost of poor ductility. Nevertheless, ductility can be improved: by alloying or by creating an additional phase through heat treatment. In the present study, this phase was retained austenite which, if present in a stable condition in a martensitic matrix, improves the material’s ductility. The experimental steel was specially alloyed in order to depress the Ms and Mf temperatures. It contained 2.5% manganese, 2.09% silicon and 1.34% chromium, with additions of nickel and molybdenum. An actual closed-die forged part was made of this steel. This forged part was then fitted with thermocouples attached to its surface and in its interior and treated using the Q&amp;P process. The Q&amp;P process is an innovative heat treatment procedure. It is characterized by rapid cooling from the soaking temperature to a quenching temperature between the Ms and Mf. Subsequent reheating and holding at a partitioning temperature stabilizes retained austenite in martensitic matrix. Cooling was performed in boiling water and then in still air without tempering.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Annals of DAAAM and Proceedings of the International DAAAM Symposium

ISBN

978-3-902734-20-4

ISSN

1726-9679

e-ISSN

neuvedeno

Počet stran výsledku

5

Strana od-do

714-718

Název nakladatele

DAAAM International Vienna

Místo vydání

Vídeň, Rakousko

Místo konání akce

Zadar, Croatia EU

Datum konání akce

24. 10. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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