Evaluation of fatigue strength of heat treated and laser hardened 42CrMo4 steel considering localized initiation mechanisms.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25797000%3A_____%2F14%3A%230000478" target="_blank" >RIV/25797000:_____/14:#0000478 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.scientific.net/KEM" target="_blank" >http://www.scientific.net/KEM</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/KEM.606.31" target="_blank" >10.4028/www.scientific.net/KEM.606.31</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of fatigue strength of heat treated and laser hardened 42CrMo4 steel considering localized initiation mechanisms.

Popis výsledku v původním jazyce

The paper contains results of a partial study of effect of laser hardening of relatively small specimens on fatigue resistance of 42CrMo4 steel. Two different parameters of laser hardening were used, one of them resulted in considerable longitudinal residual stresses - surface speed of laser beam 4 mm/s. Results of fatigue tests of basic reference material had a surprisingly high, atypical scatter, particularly in the region near fatigue limit. Fractographical analyses indicated that this scatter was connected with presence of single inclusions, even quite large, which in some cases caused fatigue crack initiation. Compressive residual stresses after the laser treatment improved fatigue strength and reduced the scatter, likely due to short crack retardation in the compressive residuals stress field. Further analyses and discussion are provided using Murakami method of fatigue life evaluation of materials containing defects.

Název v anglickém jazyce

Evaluation of fatigue strength of heat treated and laser hardened 42CrMo4 steel considering localized initiation mechanisms.

Popis výsledku anglicky

The paper contains results of a partial study of effect of laser hardening of relatively small specimens on fatigue resistance of 42CrMo4 steel. Two different parameters of laser hardening were used, one of them resulted in considerable longitudinal residual stresses - surface speed of laser beam 4 mm/s. Results of fatigue tests of basic reference material had a surprisingly high, atypical scatter, particularly in the region near fatigue limit. Fractographical analyses indicated that this scatter was connected with presence of single inclusions, even quite large, which in some cases caused fatigue crack initiation. Compressive residual stresses after the laser treatment improved fatigue strength and reduced the scatter, likely due to short crack retardation in the compressive residuals stress field. Further analyses and discussion are provided using Murakami method of fatigue life evaluation of materials containing defects.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

<a href="/cs/project/FR-TI3%2F814" target="_blank" >FR-TI3/814: Optimalizace laserového povrchového zpracování strojních součástí pro zvýšení jejich užitných vlastností</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Key Engineering Materials

ISSN

1013-9826

e-ISSN

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Svazek periodika

606

Číslo periodika v rámci svazku

2014

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

4

Strana od-do

31-34

Kód UT WoS článku

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EID výsledku v databázi Scopus

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