Volume 15, Issue 1 (March 2018)
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- Metal particle heating in a gas-laser stream with a changing of radiation power density was investigated.
- The moment of particle impact to a nozzle wall with rotation acquisition was considered.
- Temperature unevenness of a rotating and not rotating particle was received and compared.
- Heterogeneity of particles heating was confirmed by metalgraphic investigations of the composite.
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- The fine carbides precipitated through the cryogenic treatment strengthen the structure and tie up with certain elements and restrict the promotion of instability during service.
- The ultimate tensile strength of the valve steel tested at room and elevated temperatures get enhanced through the DCT.
- The DCT process parameters are optimized for better hardness, wear resistance and tensile strength using grey-Taguchi technique.
- The precipitation of fine carbides, transformation of retained austenite and refinement of carbides were the reasons behind the improvement of the mechanical properties.
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- Ge1-xCx coatings were deposited on ZnS substrates by PECVD technique.
- Optical parameters of the Ge1-xCx coatings were measured by the Swanepoel method.
- The refractive index of the coatings decreased as CH4:GeH4 increases.
- By increasing the CH4:GeH4, the optical gap of coatings was increased.
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- Friction stir welding of high density polyethylene plates was performed successfully.
- An enhanced friction model is developed for thermo-mechanical FSW analysis.
- The model was validated by measuring actual temperatures near the weld nugget.
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- Friction stir welding of thin 2024 aluminum alloy was performed successfully.
- The effect of tool rotation speed on microstructure and crystallographic texture of the joint was investigated.
- The grain structure and texture evolution during the whole process of friction stir welding were clarified.
- Stir zones exhibited different crystallographic textures
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- Lap joints of commercially pure magnesium plates to aluminium plates were conducted by friction stir welding using various traveling and rotation speeds of the tool.
- Joints with sound appearance were achieved using tool rotation of 1600rpm and welding line speeds in the range and 40–120 mm/min.
- In low rotational speeds, such as 800 and 1000 rpm, there were large weld defects like groove, tunnel, and macrovoid.
- The maximum value of microhardness in the stir zone was twice higher than the base materials.
- The joint strength in the present study was higher compared to similar works where Al plate was positioned on the top. This seems to be the result of the lower heat generation and thinner intermetallic layer formation in the stirred zone.
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