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Mechanism for Refining Grains and Effect of Microstructural Characteristics on Low-Temperature Toughness for Industrial EH460 Heavy-Gauge Steel
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-22 , DOI: 10.1002/srin.202000718 Hongtao Wang 1 , Yong Tian 1 , Qibin Ye 1 , Liye Kan 1 , Zhaodong Wang 1 , Guodong Wang 1
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-22 , DOI: 10.1002/srin.202000718 Hongtao Wang 1 , Yong Tian 1 , Qibin Ye 1 , Liye Kan 1 , Zhaodong Wang 1 , Guodong Wang 1
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The mechanism for refining grains in industrial EH460 heavy-gauge steel with a thickness of 80 mm and above is investigated using electron backscattered diffraction. Charpy impact and drop-weight tests are conducted to quantify the effect of microstructures and texture on low-temperature toughness. Abundant ferrite grains that form and impinge from different prior-austenite grains increase the high-angle grain boundary (HAGB) fraction. The result is a refined effective grain size of 3.7 ± 4.2 μm, a high HAGB fraction of 62.1%, and an average Charpy impact absorbed energy of ≈209 J at −80 °C. The excellent impact toughness is due to the high intensity of texture with types of {113}−{112}<110> and {332}<113>, as well as the uniformly distributed {110} slip planes and {001} cleavage planes. The high intensities of {110}<111> and {110}<112> also improve the drop-weight toughness. However, due to plastic constraint in the larger drop-weight specimens, increased plane strain in the inner regions is the root cause of the brittle fracture of these specimens at −70 °C. Nevertheless, the improved drop-weight performance is attributed to the plane stress deformation at the specimen edges and also the occurrence of delamination in the central section.
中文翻译：
工业EH460大规格钢晶粒细化机理及微观组织特性对低温韧性的影响
采用电子背散射衍射技术研究了80mm及以上厚度工业EH460大规格钢的晶粒细化机理。进行夏比冲击和落锤试验以量化微观结构和纹理对低温韧性的影响。从不同的原始奥氏体晶粒形成和撞击的丰富铁素体晶粒增加了高角晶界 (HAGB) 分数。结果是细化的有效晶粒尺寸为 3.7 ± 4.2 μm，HAGB 比例高达 62.1%，-80 °C 下的平均夏比冲击吸收能量约为 209 J。优异的冲击韧性是由于具有{113}-{112}<110>和{332}<113>类型的高强度织构，以及均匀分布的{110}滑移面和{001}解理面. {110}<111> 的高强度 和{110}<112>也提高了落锤韧性。然而，由于较大落锤试样的塑性约束，内部区域增加的平面应变是这些试样在 -70 °C 时脆性断裂的根本原因。然而，改进的落锤性能归因于试样边缘的平面应力变形以及中心部分分层的发生。
更新日期：2021-04-22
中文翻译：
工业EH460大规格钢晶粒细化机理及微观组织特性对低温韧性的影响
采用电子背散射衍射技术研究了80mm及以上厚度工业EH460大规格钢的晶粒细化机理。进行夏比冲击和落锤试验以量化微观结构和纹理对低温韧性的影响。从不同的原始奥氏体晶粒形成和撞击的丰富铁素体晶粒增加了高角晶界 (HAGB) 分数。结果是细化的有效晶粒尺寸为 3.7 ± 4.2 μm，HAGB 比例高达 62.1%，-80 °C 下的平均夏比冲击吸收能量约为 209 J。优异的冲击韧性是由于具有{113}-{112}<110>和{332}<113>类型的高强度织构，以及均匀分布的{110}滑移面和{001}解理面. {110}<111> 的高强度 和{110}<112>也提高了落锤韧性。然而，由于较大落锤试样的塑性约束，内部区域增加的平面应变是这些试样在 -70 °C 时脆性断裂的根本原因。然而，改进的落锤性能归因于试样边缘的平面应力变形以及中心部分分层的发生。
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