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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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960mpa高强度钢材对接焊缝的低温断裂韧性*
Keywords: 金属材料,高强度钢材,对接焊缝,低温,断裂韧性,裂纹尖端张开位移
Abstract:
？对14mm厚的960mpa结构钢材的对接焊缝进行了低温断裂韧性试验,采用三点弯曲试件,以裂纹尖端张开位移ctod为指标,对960mpa高强度钢材焊缝的断裂行为进行分析。计算出母材、焊缝区和热影响区的断裂韧性ctod临界值δm与温度的关系,采用boltzmann函数对其结果进行拟合分析,得到韧脆转变温度,并对其断裂微观机理进行分析。结果表明:断裂韧性ctod临界值δm随温度降低呈下降趋势,与q235、q345、q390及q460相比,960mpa高强度钢材的δm值最低,其焊接热影响区的δm值比焊缝金属和母材均小,其韧脆转变温度也较高(-12.45℃),低温冷脆特征更加显著。
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