الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 172 |  |  |
| | | from | 172 | | |
Abstract
Additive Manufacturing (AM) is a recent technology to produce final products directly from data of computer that depend on producing the parts layer by layer with a thickness as less as 0.03 mm. One of the main Additive Manufacturing is the selective laser melting (SLM) which can produce high quality final metallic products.
In this research, Tool Steel H13 is selected to evaluate the feasibility of producing final products and Mold inserts for injection Moulding or High pressure die casting molds by selective laser melting technique (SLM). The variables that affect the quality of the final product were chosen. The size, porosity, microstructure and mechanical properties of the produced specimens were studied.
The results showed that laser scanning speed has a great influence on the quality of SLM products. The pores structures, percentages, hardness and strength also affected by the difference of laser scanning speed. The smallest percentage of pores is 5% at the lowest scanning speed (150 mm/sec) and was increased with increasing the laser scanning speed.
The microstructure phases were retained austenite, martensite. The percentage of density was decreased with increasing of laser scanning speed. The highest percentage of density and strength was found at laser scanning speed )150 mm/sec(.
The effect of heat treatment on the quality of products was studied. The microstructure and mechanical properties of the heat treated specimens were studied. The results showed that conventional heat treatment of samples has great influence on impact Toughness and microstructure.