结果表明，沿一次晶晶界的成分偏析对裂纹扩展阻力的降低作用是铸钢中贝壳状断口形成的主要原因。
The results show that main cause of conchoidal fracture forming is that composition segregation in solidification grain boundary of casting steel reduces the resistance of crack propagation.
常温下为黑色固体，在一定的温度下凝固成很脆的具有贝壳状断口的固体，呈玻璃相；
Soft pitch is a black solid at a certain temperature , it will be solidified into a brittle solid with shell-like fracture.
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