On the ductile to brittle transition in austenitic steel
On the ductile to brittle transition in austenitic steel
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DOI：
10.1016/s0921-5093(97)00196-2
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发表时间：
1997-08
期刊：
影响因子：
6.4
通讯作者：
P. Müllner
中科院分区：
文献类型：
--
作者：
P. Müllner
奥氏体钢的断裂模式可能具有韧脆转变（DBT），这取决于合金成分和温度。交叉变形孪晶作为裂纹的形核因子，在决定断裂模式方面起着关键作用。特别是在孪晶非常薄且位错密度极低的高氮钢的低温变形时发生脆性断裂。从微观结构和应力状态两个方面对DBT进行了讨论。结果表明，对于薄的孪晶和低位错密度：（i）抑制孪晶-孪晶穿透;和（ii）增长的裂纹尖端不能钝化。
The fracture mode of austenitic steel may feature a ductile to brittle transition (DBT), depending on alloy composition and temperature. As crack nucleators, intersecting deformation twins play a key role in determining the fracture mode. In particular, brittle fracture occurs at low temperature deformation of high nitrogen steel where twins are very thin and the dislocation density is extremely low. The DBT is discussed in terms of microstructure and stress state. It is shown that for thin twins and low dislocation density: (i) twin-twin penetration is suppressed; and (ii) the tip of a growing crack cannot blunt.