Metallography and Microstructure in Ancient and Historic by David A. Scott

By David A. Scott

This booklet presents an advent to the constitution and morphology of historic and ancient steel fabrics. It bargains largely with many useful issues with regards to the mounting, guidance, etching, sharpening, and microscopy of metal samples and contains an account of how during which part diagrams can be utilized to aid structural interpretation. The textual content is supplemented through an in depth variety of microstructural reviews conducted within the laboratory on historic and ancient metals.

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Extra info for Metallography and Microstructure in Ancient and Historic Metals (Getty Trust Publications: Getty Conservation Institute)

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At this par­ spersed mixture and under the microscope in ticular composition and temperature-which etched section will look something like Figure 20a. 19. Eutectialclophase ofFigsiurelver-copper ys. diagram B+L eutectic point alloy C ! alloy B composition Two-phased Materials 13 Fimigcurerostructures. 20a. b. Eutectic-type alpha beta eutectic infil of alpha beta eutectic + + dendri usuallytescoredof alpha b a Figinurea 60% 21. CuThealloyfeathery nature of dendri tic that has been cast. Etched caniinnfipotassi bel of seenumcldicannot ecarlhromate.

2413... 57. Eutectic structures An example is the range of alloys formed between ' silver and gold. Gold is soluble in silver and silver Eutectoid structures is soluble in gold. The phase diagram that results Peritectic structures from this kind of alloy shows just one solid phase Widmanstatten transformations present at all temperatures up to the solidus. The Discontinuous precipitation solidus line separates the region of solid metal 6. Intermetallic compound formation from the pasty stage of solidification at tempera­ tures above this line.

Mixtures oflath and plate martensite occur in water or other liquids at room temperature. A steels up to about 1 % carbon, while the plate steel artifact is usually heated up to the austenite form predominates over 1 % carbon. Sometimes region of the phase diagram, abour 800-950 °c, darker etching networks in bisulfite or nital are then quickly plunged into cold water, thus form­ composed of plate martensite. ing the extremely hard martensite constituent. Some of the hardness and brittleness could then The hardness of martensite is determined by its carbon content which can vary from about be removed to various degrees by tempering, usu­ 300 Hy at 0 .

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