This research is based on ¡§GTAW¡¨ mode, toweld the premixedferrite, molybdenum, and carbon powders on SC45 carbon steel substrate.
Learning from the previous experiments, a wear test under a high temperature of 450¢J, was employed to get the Ring-disk coefficients of
sliding friction about 0.3, the depletion amounts to 0.67 mg Nm per million, that exhibited a better hardness and anti-wear property than the
substrate.
The welding layer¡¦s solidification structure was examined by XRD,SEM, EPMA and TEM.
The experimental results revealed that in the layer welded with GTAW, primary dendritic arms are of eutectic solidification structures.
In X sample, £]-Mo2C is located in the dendrite closed to the un-melted zone. We can see that £^ phase (dispersed phase) with the rod shape solidified in the dendrite. And then £b-Fe3Mo3C (continuous phase) solidified between the rod spacing.
In Z sample, £b-Fe3Mo3C solidified as dendrite first, and then the £^ phase solidified between the inter-dendrite. The solidification path is ¡§£\ + L ¡÷ £\ + £^ + L ¡÷ £\ + £^ + L+ £b ¡÷ £^ + £b¡¨.
£^ phase and £b-Fe3Mo3C are both FCC structures in an ordered phase, and the coherence of lattice is good, with a perfect orientation
relationship.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0716103-120549 |
| Date | 16 July 2003 |
| Creators | CHOU, HENG-CHUNG |
| Contributors | New-Jin Ho, Der-shin Gan, Pouyan Shen |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0716103-120549 |
| Rights | campus_withheld, Copyright information available at source archive |
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