The result shows that the fracture mode is low stress brittle fracture. The fracture is mainly caused by needle type martensite in the heat affected zone of the weld joint.
结果表明，在连接杆焊缝附近的热影响区中存在大量针状马氏体组织，在低应力的作用下，导致材料发生脆性断裂。
Longitudinal crack of drill pipe box joint is brittle fracture at low stress.
钻杆接头的各种纵向开裂属于低应力脆性断裂。
The failure of the driving shaft in a hoister is caused by typical brittle fracture under low stress.
卷扬机传动轴的断裂为典型的低应力脆断事故，主要原因是传动轴的组织疏松、晶粒粗大、。
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