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首页> 外文期刊>Materials Science and Engineering >Effect of coiling temperature on impact toughness of hot rolled ultra-high-strength multiphase steel strips
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Effect of coiling temperature on impact toughness of hot rolled ultra-high-strength multiphase steel strips

机译：卷取温度对热轧超高强度多相钢带冲击韧性的影响

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摘要

The tensile and Charpy impact properties of four strip samples from two different B-added low-C ultra-high-strength steel strips (Al-treated and Ti-treated), coiled at two different temperature ranges (360-380 °C and 450-460 °C), have been evaluated and correlated to the microstructural parameters, dislocation density, and the intensity of high-angle boundaries. The effects of coiling temperatures on the microstructural evolution and mechanical properties have been discussed. The volume fraction of the individual phase constituents (namely, granular bainite, upper bainite, lower bainite and tempered martensite) and their hardness, local deformation response and the strain-hardening ability, as determined from nanoindentation testing, influenced the bulk properties such as hardness, tensile properties (strength and ductility), Charpy impact properties (upper shelf energy, USE, and ductile-to-brittle transition temperature, DBTT) and strain-hardening abilities under both quasi-static and dynamic loading conditions. The dominance of granular bainite and upper bainite (75-90 %) reduced the strength (670-722 MPa yield strength), improved ductility (16.7-19.5 % elongation to failure) and USE (35-42 J) in the samples coiled at the higher temperatures. In contrast, a higher fraction of tempered martensite and lower bainite (78-82 %) significantly increased the strength (808-814 MPa), reduced ductility (13.0-14.5 %) and USE (19-29 J) in the lower temperature coiled samples. The DBTT showed a complex trend with the microstructural parameters. It depended on the USE level, as well as on the 'effective grain size' of the matrix.
机译：来自两个不同B添加的低C超高强度钢带（Al处理和Ti处理）的四条带样品的拉伸和夏比冲击性能，在两个不同的温度范围内卷绕（360-380°C和450已经评估和相关于微结构参数，位错密度和高角度边界的强度进行评估和相关。讨论了卷绕温度对微观结构演化和机械性能的影响。单个相成分的体积分数（即颗粒状贝氏体，上贝氏体，下贝氏体，低贝氏体和回火马氏体）及其硬度，局部变形响应和应变硬化能力，如纳米茚定值检测所确定的，影响了散装性质如硬度，拉伸性能（强度和延展性），夏比冲击性能（上搁板能量，使用，使用韧性，DBTT）和抗动态负载均衡条件下的应变硬化能力。粒状贝氏体和上贝氏体（75-90％）的优势降低了强度（670-722MPa屈服强度），提高了延展性（伸长率为5.7-19.5％，伸长率为5％），并在样品中使用（35-42J）较高的温度。相比之下，较高的钢化马氏体和低贝氏体（78-82％）显着提高了强度（808-814MPa），降低延展性（13.0-14.5％），在较低温度下使用（19-29 j）样品。 DBTT显示出具有微观结构参数的复杂趋势。它取决于使用水平，以及矩阵的“有效粒度”。

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