Porovnání nízko-cyklové únavy ADI litiny legované niklem s ruznými matricemi

Comparison of low cycle fatigue of ductile cast irons with different matrix alloyed with nickel

journal article - other

en

Total strain controlled tests have been performed on cylindrical specimens of austempered ductile cast iron (ADI) and ductile cast iron with the ferritic matrix, both alloyed with 2.75% Ni, with the aim to compare cyclic plasticity and the fatigue life at temperatures 23 C and – 45 C. Microstructure and its features are documented using light microscope (image analysis) and neutron diffraction. In ADI the measurement of retained austenite by neutron diffraction before and after fatigue tests is used to discuss the cyclic stress-strain response. Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were obtained for both temperatures and materials. Cyclic stress-strain curve obtained at – 45 C is shifted to higher stress amplitudes relative to room temperature curve. The fatigue life curves at both temperatures can be well approximated by the Manson-Coffin and Basquin laws. The Manson-Coffin curves are identical for both materials and temperatures while the Basquin curve is shifted to longer fatigue life for ADI. The surface relief developed during fatigue was studied using SEM. Fatigue cracks initiated preferably from persistent slip markings at the interface of graphite nodule.

Na válcových zkušebních tyčích z ADI litiny a tvárné litiny s feritickou matrici ( obě legované 2,75%Ni) byly provedeny únavové zkoušky v režimu řízení celkové deformace za cílem porovnat cyklickou plasticitu a únavový život při teplotách 23 C a – 45 C. Mikrostruktura byla zdokumentovaná pomocí světelné mikroskopie ( obrazová analyza ) a neutronové difrakce. Neutronová difrakce byla použita za účelem změření množství zbytkového austenitu před a po únavové zkoušce a k vysvětlení napěťové-deformační odezvy experimentálního materiálu. Při obou teplotách byly získány křivky cyklického zpevnění/změkčení, cyklické deformační křivky a křivky únavové životnosti. Povrchový reliéf, jenž vznikl po cyklickém zatěžování byl studován s použitím SEM. Únavové trhliny vznikaly především z persistentních skluzových stop na rozhraní grafitických nodulí a matrice.

Total strain controlled tests have been performed on cylindrical specimens of austempered ductile cast iron (ADI) and ductile cast iron with the ferritic matrix, both alloyed with 2.75% Ni, with the aim to compare cyclic plasticity and the fatigue life at temperatures 23 C and – 45 C. Microstructure and its features are documented using light microscope (image analysis) and neutron diffraction. In ADI the measurement of retained austenite by neutron diffraction before and after fatigue tests is used to discuss the cyclic stress-strain response. Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were obtained for both temperatures and materials. Cyclic stress-strain curve obtained at – 45 C is shifted to higher stress amplitudes relative to room temperature curve. The fatigue life curves at both temperatures can be well approximated by the Manson-Coffin and Basquin laws. The Manson-Coffin curves are identical for both materials and temperatures while the Basquin curve is shifted to longer fatigue life for ADI. The surface relief developed during fatigue was studied using SEM. Fatigue cracks initiated preferably from persistent slip markings at the interface of graphite nodule.

nízko-cyklová únava; feritická ADI litina; legování niklem; neutronová difrakce; iniciace únavové trhliny; snížené teploty

Low cycle fatigue; Ferritic ductile cast iron; ADI; Nickel alloying; Neutron diffraction; Fatigue crack initiation; Depressed temperature

2010

06.06.2010

Elsevier

Amsterdam

1877-7058

Procedia Engineering

2010

2

2307–2316

9