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首页> 外文期刊>Materials Science and Engineering >Microstructural characteristics and impact fracture behavior of a high-strength low-alloy steel treated by intercritical heat treatment
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Microstructural characteristics and impact fracture behavior of a high-strength low-alloy steel treated by intercritical heat treatment

机译：临界热处理高强度低合金钢的显微组织特征和冲击断裂行为

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摘要

Effects of the intercritical heat treatment (IHT) on microstructural evolution and Charpy impact fracture behavior of a high-strength low-alloy (HSLA) steel were investigated. The toughening mechanism was clarified by analyzing microstructural characteristics and crack propagation paths. Results showed that a composite microstructure of ferrite phase separated by globular, rod and irregular shape martensite was obtained by adding the intercritical quenching to the conventional heat treatment of quenching and tempering. And 3.6% retained austenite was detectable in the microstructure. The percentage content of high-angle (15° or more) boundaries reached 78.5%. It was also found that the steel had a high ratio of propagation energy (average: 152J) to the total absorbed energy (average: 212J) during impacting at -40℃ Two crack propagation path models were observed: along the long axis direction of banded ferrite, and across the grains and corresponding interfaces. The improvement of impact toughness was attributed mainly to the retained austenite, the interlocking arrangement of banded ferrite and the ferrite-martensite interfaces with high-angle misorientation, which exhibited effective resistance to the crack propagation.
机译：研究了临界热处理（IHT）对高强度低合金（HSLA）钢的显微组织演变和夏比冲击断裂行为的影响。通过分析显微组织特征和裂纹扩展路径，阐明了增韧机理。结果表明，通过在传统的淬火和回火热处理中加入临界淬火，可以获得由球状，棒状和不规则形状的马氏体分离的铁素体相的复合组织。在显微组织中可检测到3.6％的残余奥氏体。高角度（15°或更高）边界的百分比含量达到78.5％。还发现该钢在-40℃冲击时具有较高的传播能量（平均：152J）与总吸收能量（平均：212J）的比率，观察到两个裂纹传播路径模型：沿带状的长轴方向铁素体，并穿过晶粒和相应的界面。冲击韧性的提高主要归因于残余奥氏体，带状铁素体的互锁排列以及具有大角度取向不良的铁素体-马氏体界面，从而有效地抵抗了裂纹的扩展。

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