THE INFLUENCE OF MICROSTRUCTURE AND HYDROGEN-CONTAINING ENVIRONMENT ON THE INTENSITY OF CAST IRON AND STEEL DAMAGE BY SLIDING FRICTION

PART 1. THE CONSTRUCTION OF A  GENERALIZED MODEL OF  SURFACE  LAYER FRICTION OF  GRAPHITIZED STEEL AND CAST-IRON OBJECTS


PART 1, PART 2, PART 3, PART 4, PART 5, PART 6, PART 7

Cold-work manganese steels are  prospective tribotechnical materials [15]. In spite of the fact that these materials are rather difficult in machining by  metal-cutting machine tools, insufficiently processed surfaces (Fig. 12 - samples 1, 2) they  keep well a layered lubricant such as  graphite during  sliding friction. After machining (Fig. 12 sample 3) the graphitized cast-iron gives in to manganese steel because of the cleanliness of the  surface and its roughness.

Nevertheless, considering that the significant part of triboconjugation works during lubricating, it is possible to achieve a high quality of friction surface (Fig. 12 sample 4).

Fig. 12. Surfaces of friction pin of cold-work manganese steel (1,2) and graphitized manganese cast-iron  (3) before  (1, 2, 3) and after tests (4).

 

In this work the main attention is given to tribotechnical properties of both steel and cast-iron and the dependence of their properties on the microstructure and the  influence of alloying elements. It should be  noted  that in triboconjugation there are complex enough interactions between contacting surfaces at all stages is unreal. That is why we plan to reveal  new facts in the second part of our  paper.

 

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Wpływ mikrostruktury i środowisk wodoronośnych na intensywność zużycia ciernego żeliw i stali. Część I: Budowa uogólnionego modelu tarcia w warstwach wierzchnich detali wykonanych z grafityzowanych stali i żeliw.

 

Słowa kluczowe:

Mikrostruktura, wodór, tarcie, stal grafityzowana, żeliwo.

 

Streszczenie:

W pracy przedstawiono analizę mechanizmów zużycia ciernego, dokonaną w oparciu o źródła literaturowe i wyniki badań własnych. Zaprezentowano uogólniony model wpływu mikrostruktury, składu chemicznego i wodoronośnego oddziaływania smarów na procesy zużycia warstwy wierzchniej żeliw i stali grafityzowanych. Jako podstawowe czynniki warunkujące intensywność zużycia określono ciśnienie, prędkość liniową w węźle tarcia oraz skład chemiczny i mikrostrukturę stali.