Abstract
Special kinds of carbides like the big carbide which is the product of eutectic reaction, the net carbide which is precipitated at Acm transformation and the plate carbide which is precipitated at A1 transformation, have the tendency to make cracks easily than matrixferrite or martensite
These cracks in carbides made the rupture strength of steel decreased considerably.
Net or massive carbides which are precipitated at Acm transformation in 1.4% C file steel show different kinds of cracks depending on different kinds of stresses-compressive or tensile.
When compressive stress was forced to the sample, unusual cracks such as "burst of carbide" were observed.
