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CONTRIBUCION DEL ANALISIS DE LA FUNDICION BLANCA

MAY 1930   -  Volume: 5 -  Pages: 217-220

DOI:

[No data]

Authors:

JOSE MARIA TOSANTOS

Disciplines:

  • Metallurgical technology (FUNDICIONES )

Downloads:   320

How to cite this paper:  
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Received Date :   1 May 1930


Key words:
fundición, blanca,
Article type:
ARTICULO DE INVESTIGACION / RESEARCH ARTICLE
Section:
VARIOUS

En el análisis microscópico de muchas muestras de fundición blanca veníamos observando, aun cuando en muy distintas proporciones, la presencia de un constituyente (microfotografía 1) en contacto generalmente con los cristales de cementita eutéctica o bien rodeando los de cementita pro-eutoctoide (no habiendo examinado ninguna muestra con más de 4,3% de carbono, claro es que ninguna contenía cementita primaria) que permanecía sensiblemente inalterable por ataque moderado con los reactivos ácidos corrientemente empleados (ácido pícrico 5 %—alcohol (Igevsky); ácido nítrico 5%— alcohol), pero que una observación microscópica un poco detenida permitía diferenciarlo de la cementita: a) Por lo menos enérgicamente definido de sus contornos. b) Porque observado con luz oblicua aparece en un plano inferior que la cementita ; atacadas varias muestras, para comprobar definitivamente dicha diferenciación, con una disolución hirviendo preparada según Kourbatoff: 2 gr. de ácido pícrico 98 c.c. de hidróxido sódico al 25%; el citado constituyente permaneció inalterable mientras la cementita quedó coloreada (microfotografía 2).

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