390 MPa级低合金高强钢的低温韧性
Low Temperature Toughness of 390 MPa Grade High Strength Low Alloy Steel
摘 要
采用系列冲击试验研究了控轧控冷技术生产的390 MPa级低合金高强钢的低温韧性, 并分析了其低温韧性与组织特征的关系。结果表明: 该钢具有良好的低温韧性, 在-40 ℃时的冲击功为127 J, 远大于相关标准的技术要求, 按照能量法确定的韧脆转变温度为-56 ℃; 由于该钢晶粒十分细小, 裂纹在扩展过程中频繁改变断裂路径, 提高了其抵抗解理断裂的能力, 从而使其具有良好的低温韧性。
低温韧性
有效晶粒尺寸
high strength low alloy steel
low temperature toughness
effective grain size
Abstract
Series of impact test was carried to a kind of 390 MPa grade high strength low alloy(HSLA) steel produced by thermo mechanical control process (TMCP) to study its low temperature toughness, and the correlation of low temperature toughness and microstructural characteristics was also investigated. The results show that the low temperature toughness of the steel was good. The impact absorbing energy was 127 J at -40 ℃ which was much higher than the specifications of related standard, and ductile-brittle transition temperature(DBTT) was -56 ℃. Cleavage crack propagation direction deflected frequently because of its fine effective grain size, which increased the resistance to the cleavage fracture, so the steel has excellent low temperature toughness.
中图分类号 TG113.25
所属栏目 试验与研究
基金项目
收稿日期 2011/10/27
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备注潘晓丽(1962-), 女, 高级工程师, 学士。
引用该论文: PAN Xiao-li,ZHU Jian,WANG Bing-xin. Low Temperature Toughness of 390 MPa Grade High Strength Low Alloy Steel[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2012, 48(4): 221～223
潘晓丽,朱健,王秉新. 390 MPa级低合金高强钢的低温韧性[J]. 理化检验－物理分册, 2012, 48(4): 221～223
被引情况:
【1】张锦,张瑞雪,马丽,马文进, "影响B50A224钢韧脆转变温度的因素",理化检验－物理分册 51, 105-108(2015)
【2】陈晓泉, "容器钢低温韧度偏低的原因分析",理化检验－物理分册 51, 466-469(2015)
【3】张锦,张瑞雪,马文进,仇国民, "δ-Fe对ZG06Gr13Ni4Mo不锈钢韧脆转变温度的影响",理化检验－物理分册 49, 139-143(2013)
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参考文献
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【3】李国忠,曹红福,惠荣,等.钛铝含量对低合金高强度钢Q345D低温韧性的影响[J]. 特殊钢,2002,23(1):53-54.
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【7】KIM Y M,SHIN S Y,LEE H,et al.Effects of molybdenum and vanadium addition on tensile and Charpy impact properties of API X70 linepipe steels[J]. Metallurgical and Materials Transactions A,2007,38:1731-1742.
【8】KIM S,LEE S, LEE B S.Effects of grain size on fracutre toughness in transition temperature region of Mn-Mo-Ni low-alloy steels[J]. Materials Science and Engineering A,2003,359:198-209.
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