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1
Content available Microstructure and microhardness of Ti6Al4V alloy treated by GTAW SiC alloying
Bochnowski W.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
261-266
EN
In this work, the change of the structure and microhardness of Ti6Al4V titanium alloy after remelting and remelting with SiC alloing by electric arc welding (GTAW method) was studied. The current intensity equal 100 A and fixed scan speed rate equal 0,2 m/min has been used to remelting surface of the alloy. Change of structure were investigated by optical and scanning electron microscopy. Microhardness test showed, that the remelting of the surface does not change the hardness of the alloy. Treated by GTAW SiC alloying leads to the formation of hard (570 HV0,1) surface layer with a thickness of 2 mm. The resulting surface layer is characterized by diverse morphology alloyed zone. The fracture of alloy after conventional heat treatment, similarly to fracture after remelting with GTAW is characterized by extremely fine dimples of plastic deformation. In the alloyed specimens the intergranular and crystalline fracture was identified.
2
Content available remote Influence of parameters GTAW remelting process on the tribological properties of the 100Cr6 bearing steel
Bochnowski W.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
43-46
EN
In this work, the influence of parameters gas tungsten arc welding on the surface properties of a 100Cr6 steel was studied. Four different the current intensity has been used to remelting surface of the steel. Results of the effect of the current intensity arc electric on the microhardness, friction coefficient and wear intensity 100Cr6 steel was presented. Wear mechanisms were investigated by optical and scanning electron microscopy. Tribological test showed that the remelting with current intensity to 60A surface of the 100Cr6 leads to reduction of wear intensity in comparison to the conventional heat treatment. If treatment was made with current arc intensity - 80 A and more the wear intensity increased. During tribology tests two kinds wear material were distinguished: abrasive wear and adhesive wear.
3
Content available remote The influence of the arc plasma treatment on the structure and microhardness C120U carbon tool steel
Bochnowski W.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1 spec.
331--334
EN
The examination of the structure and microhardness of surface layer of C120 U carbon tool steel after arc treatment are presented in the paper. They are compared with the properties obtained after conventional hardening. The GTAW (Gas Tungsten Arc Welding) method was used. The remelted zone consists of dendritic cells and columnar crystals. Inside the columnar crystals dependent to current arc plasma intensity the martensite or lower bainite was observed. The cooling rate of the remelted zone is similar to the cooling rate obtained in the classical heat treatment. The maximum hardness 650 HV0,1 was measured in material after treatment with a smaller current intensity of arc plasma – 60A. Increases of the current intensity of arc plasma from 60 A to 110 A (for fixed speed rate of source) lead to increases the depth of the remelted zone from 1,2 to 3,1 mm. Thickness of the heat affected zone in the all specimens was similar (1,9 to 2,1 mm).
4
Content available remote The influence of the arc plasma treatment on the structure and microhardness 100Cr6 bearing steel
Bochnowski W.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 2
19--22
EN
The effect of arc plasma treatment on structure and microhardness of 100Cr6 steel was investigated. Four different the current intensity has been used to remelting surface of the steel. SEM and LM microscopes have been used to evaluate microstructure of remelted zone (RZ). In the remelting zone (RZ) were obtained characteristic for rapid crystallization process the dendritic cell structure. Inside the dendritic cells in dependency to current intensity of arc, the martensite or bainite and retained austenite was observed. On the boundaries of the dendritic cells as a result of segregation of C and Cr the alloyed cementite is formed. The cooling rate of the remelted zone is higher than the cooling rate obtained in the classical heat treatment. The maximum hardness 840 HV0,1 was measured in material after treatment with a smaller current intensity of arc plasma – 60A. Increases of the current intensity of arc plasma from 60 A to 110 A (for fixed speed rate of source) lead to increases the depth of the remelted zone from 1,5 to 2,3 mm.
5
Content available remote The influence of arc plasma electric and laser treatment on the structure and properties of the high speed steel
Bochnowski W.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 3
17-20
EN
The examination of the structure, hardness and abrasion resistance of surface layer of high speed steel: HS 2-10-1-8, HS 6-5-2 and HS 10-2-5-8 after arc plasma and laser welding are presented in the paper. They are compared with the properties obtained after conventional hardening. Diode laser of continuous operation and GTAW (Gas Tungsten Arc Welding) method were used. As a result of concentrated energy beam treatment applied to a steels surface layer, the structures characteristic of rapid solidification / crystallization process were obtained. The treatment of the steel by arc plasma electric with a single remelted track about 7 mm width does not lead to growth of the mechanical and tribological properties of high speed steels. The growth of microhardness as well as low the coefficient Archard of the high speed steel after remelting on the surface single track about 6 mm width by diode laser using can be obtained.
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