Write name of defects observed in brass
Answers
Answer:
The casting step of leaded brass billet may be including some defects such as surface and lead clustering defects, zinc segregation, cavities with porosity and non-metallic contaminations due to the effects of recycle rate, impurities and casting parameters.
DEFECTS OBSERVED IN BRASS
Explanation:
Brass Defect:-
A defect is an irregularity produced during the metal production process that is undesired and cannot be tolerated. These defects are divided into two types depending upon the process of production.
A. Hidden Defects
These defects occur during casting stage of brass. These defects are hidden / undersurface and usually become evident in subsequent machining processes which lead to the rejection of finished products. There are five main categories of casting defects;
a) Shrinkage defects
b) Gas porosity
c) Mold material defects
d) Pouring metal defects
e) Metallurgical defects
B. Surface Defects
Following are the common types of surface defects;
i. Blister; This form when air traps in the material and develops envelops which appears on one or both sides of the strip consisting of swellings.
ii. Scaly; This defect develops as a result of peeling / bursting of blister during Hot or Cold rolling.
iii. Red strains; This defect occurs when Un-dissolved copper appears on the upper surface of the strip.
iv. Cracks; Such type of defects is due to breakage of grains & improper mixing of material during lead rolling mixing.