Experiments of Strain Ageing Sensibility of NVB Ship Plate Steel
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摘要: 研究了不同塑性变形量的应变时效对NVB钢板的强度、塑性及低温韧性和脆性转变温度的影响。结果表明,NVB钢板的应变时效敏感性较低,经5%时效后仍具有较好的低温韧性。通过微观组织分析,探讨了不同温度下的金相组织和冲击断口形貌特征。实验表明,带状组织易导致材料韧性的恶化,钙硅酸盐类非金属夹杂物对脆性转变温度有不良作用,容易加速钢板的脆化倾向。还从位错角度对应变时效的微观机理进行了简要阐述。Abstract: The effect of different plastic deformation strain ageing on the performance of NVB ship plate steel has been studied which includes strength,ductility,low temperature toughness and brittle-ductile transition temperature.As a result,NVB ship plate steel is less sensitive to strain ageing,and after 5% aged,low temperature toughness of plateis is still good.By means of microstructure analysis,microstructure and shear fracture morphology at different temperature are discussed.The results show,banded structure worsen toughness, nonmetallic inclusions has negative for brittle-ductile transition temperature.This article also expatiate strain ageing mechanism in dislocation aspect.
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Key words:
- NVB ship plate steel /
- plastic deformation /
- low temperature toughness /
- strain ageing /
- shear fracture
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