船舶主机和辅机等机械设备的机体裂纹是非常危险的缺陷，裂纹延展会导致机器报废或发生严重事故。
Cracks on engine bodies, no matter main engine or auxiliary one, are very dangerous defects, extension of which will lead to the engine discarded or serious accident.
使钢产生热脆性，降低钢的延展性和韧性，在锻造和轧制时形成裂纹。
Causes the steel to produce the hot brittleness, reduces the steel the ductility and the toughness, when forging and rolling crack.
出现这种情况后，裂纹的长度会扩展，造成部件延展断裂。
In these cases, the cracks can propagate to the critical length and result in ductile fracture of the component.
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