| Assessment of Friction Stir Welding (FSW) on tribological performance of Nano-TiO2 doped API- X70 steel |
| Paper ID : 1022-UFGNSM-FULL |
| Authors: |
|
NADER MASTOORI1, kamran dehghani2, Nader Mastoori *3 1tehran 2Amirkabir University of Technology 3Amirkabir university of technology |
| Abstract: |
| The type of high-strength low-alloy (HSLA) steels which provides better mechanical properties and greater resistance to corrosion in comparison with carbon steels, have been used more frequently over the last few decades. These group of steels are replacing the previous generation of steels in numerous industries because of weight and cost savings due to improved toughness, and weldability. In current resarch work, Nano-TiO2 powders were incorporated by using FSW into the commercially API-X70 steel to form a surface Nano-composite. The effect of different processing parameters on hardness and wear characterization of the stir zone was investigated. Microstructural observations of the modified surfaces were carried out by employing optical and electron microscopy. Microstructural evolution, and tribological performance of samples were investigated as a function of tool geometery (Cylindrical, Triangular and square pin). The results showed that the hardness of produced surface composites was improved significantly as compared to base alloy. The results of tensile testing also showed that doping the TiO2 nano-powder improves ultimate tensile strength (UTS) values of the obtained surface composites. Dry sliding wear performance of the surface composites revealed that the addition of TiO2 is a effective way for improving the wear properteis by altering wear mechanism from adhesion to abrasion. |
| Keywords: |
| Nano-TiO2 powders, HSLA X70, tribological, adhesion. |
| Status : Paper Accepted (Poster Presentation) |
