焊接热输入量对Mg处理钢粗晶热影响区组织和低温韧性的影响
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摘要
采用焊接热模拟试验研究了四种热输入对Mg处理钢粗晶热影响区组织及低温韧性的影响。结果表明:随热输入量从50 kJ/cm增加至200 kJ/cm,粗晶热影响区的原奥氏体尺寸从134μm增加至298μm,针状铁素体含量由40.5%减小至25.9%,M-A组元平均尺寸从0.76μm增加至1.14μm,M-A组元所占比例从3.69%增加到5.50%。当热输入量超过100 kJ/cm时,晶内粒状贝氏体消失。粗晶热影响区在-20℃的冲击功由热输入量50 kJ/cm时的84 J降低至200 kJ/cm时的40 J。
The effect of four heat inputs on the microstructure and low temperature toughness of the coarse grain heat affected zone of Mg treated steel was investigated by welding thermal simulations. When the heat input increases from 50 kJ/cm to 200 kJ/cm, the prior austenite grain size increases from 134 μm to 298 μm, the content of acicular ferrite decreases from 40.5% to 25.9%, the size of M-A constituent increases from 0.76 μm to 1.14 μm, and the fraction of M-A constituent increases from 3.69% to 5.50%. The granular bainite in coarse grain heat affected zone disappears with heat input exceeding100 kJ/cm. The impact energy of the coarse grain heat affected zone at-20 ℃ decreases from 84 J under heat input of 50 k J/cm to 40 J under heat input of 200 kJ/cm.
The effect of four heat inputs on the microstructure and low temperature toughness of the coarse grain heat affected zone of Mg treated steel was investigated by welding thermal simulations. When the heat input increases from 50 kJ/cm to 200 kJ/cm, the prior austenite grain size increases from 134 μm to 298 μm, the content of acicular ferrite decreases from 40.5% to 25.9%, the size of M-A constituent increases from 0.76 μm to 1.14 μm, and the fraction of M-A constituent increases from 3.69% to 5.50%. The granular bainite in coarse grain heat affected zone disappears with heat input exceeding100 kJ/cm. The impact energy of the coarse grain heat affected zone at-20 ℃ decreases from 84 J under heat input of 50 k J/cm to 40 J under heat input of 200 kJ/cm.
引文
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[9]田俊,王德永,屈天鹏,等. Mg处理对X65管线钢中夹杂物的影响[J].炼钢,2018,34(5):43-49.
[10]赵辉,胡水平,武会宾,等. Mg处理高钢级管线钢焊接热影响区晶内铁素体形核机制研究[J].钢铁,2010,45(2):82-85.
[11] Kim S, Kang D, Kim T W, et al. Fatigue crack growth behavior of the simulated HAZ of 800MPa grade high-performance steel[J].Materials Science&Engineering A, 2011, 528(6):2331-2338.
[2] Liu W, Zhou Q, Li L, et al. Effect of alloy element on corrosion behavior of the huge crude oil storage tank steel in sea water[J].Journal of Alloys&Compounds, 2014, 598(12):198-204.
[3]张伟,崔嵬,王垒.建筑钢结构高强钢焊接的三项关键技术[J].电焊机, 2016, 46(12):88-92.
[4] Zhang Y, Li X B, Ma H. Enhancement of heat-affected zone toughness of a low carbon steel by TiN particle[J]. Metallurgical and Materials Transactions B, 2016, 47(4):2148-2156.
[5] Zhang T S, Wang D Y, Jiang M F. Effect of magnesium on evolution of oxide and sulphide in liquid iron at 1873 K[J].JISI,2014, 21(12):1073-1080.
[6]梁冬梅,朱远志,周立新等.钢中针状铁素体及其非均匀形核机制[J].金属热处理,2011,36(12):105-111.
[7] Lambert A, Drillet J, Gourgues A F, et al. Microstructure of martensite-austenite constituents in heat affected zones of high strength low alloy steel welds in relation to toughness properties[J]. Science and Technology of Welding and Joining, 2000, 5(3):168-173.
[8]黄安国,余圣甫,谢明立,等.低合金钢焊缝的针状铁素体微观组织[J].焊接学报,2008,29(3):45.
[9]田俊,王德永,屈天鹏,等. Mg处理对X65管线钢中夹杂物的影响[J].炼钢,2018,34(5):43-49.
[10]赵辉,胡水平,武会宾,等. Mg处理高钢级管线钢焊接热影响区晶内铁素体形核机制研究[J].钢铁,2010,45(2):82-85.
[11] Kim S, Kang D, Kim T W, et al. Fatigue crack growth behavior of the simulated HAZ of 800MPa grade high-performance steel[J].Materials Science&Engineering A, 2011, 528(6):2331-2338.