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首页> 外文期刊>Materials Science and Engineering >Splitting In Dual-phase 590 High Strength Steel Plates Part Ii. Quantitative Analysis And Its Effect On Charpy Impact Energy
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Splitting In Dual-phase 590 High Strength Steel Plates Part Ii. Quantitative Analysis And Its Effect On Charpy Impact Energy

机译：分裂成双相590高强度钢板第II部分。定量分析及其对夏比冲击能的影响

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摘要

The influence of splitting on Charpy impact energy was investigated by analyzing the primary fracture (from the Charpy V-notch) and splitting (secondary fracture) surfaces at different test temperatures quantitatively. The morphology of splitting at the primary fracture surface of Charpy impact specimens made of dual-phase (DP) 590 hot-rolled steel in TL direction at +60 ℃ and -30 ℃ were surveyed by scanning electron microscope (SEM). The broken Charpy impact specimens in both TL and LT directions at different test temperatures were studied by examining sliced images obtained from micro-radiography imaging system. Three-dimension (3D) and plane sliced images of specimens were analyzed using GEHC microview software. Results show that fracture appearance inside the splitting is cleavage. The length and depth of the splitting increased with decreasing test temperature. Splitting width decreased first then the trend becomes irregular when test temperature falls due to variation of steel ductility and reaction between splitting and the primary crack. The surface areas of splitting and primary crack changed with test temperature as well. Splitting area increased with decreasing test temperature, while the surface area of the primary crack decreased as the test temperature was lowered. Influence of splitting on the impact energy in upper shelf of DP590 hot-rolled steel is small. In the ductile-to-brittle transition temperature (DBTT) range, splitting tends to increase the Charpy impact energy and consequently reduced the DBTT of DP590 hot-rolled steel.
机译：通过定量分析不同测试温度下的一次断裂（来自夏比V型缺口）和分裂（二次断裂）表面，研究了分裂对夏比冲击能的影响。用扫描电子显微镜（SEM）观察了由双相（DP）590热轧钢制成的夏比冲击试样的一次断裂面在TL方向上在+ 60℃和-30℃下的断裂形态。通过检查从显微射线照相成像系统获得的切片图像，研究了在不同测试温度下在TL和LT方向断裂的夏比冲击试样。标本的三维（3D）和平面切片图像使用GEHC microview软件进行了分析。结果表明，裂缝内部的裂缝外观是分裂的。裂痕的长度和深度随着测试温度的降低而增加。由于钢的延展性以及开裂和初生裂纹之间的反应，当测试温度下降时，开裂宽度首先减小，然后趋势变得不规则。断裂和初生裂纹的表面积也随测试温度而变化。随着测试温度的降低，劈裂面积增加，而随着测试温度的降低，一次裂纹的表面积减小。分裂对DP590热轧钢上架冲击能量的影响很小。在延性转变为脆性转变温度（DBTT）的范围内，开裂会增加夏比冲击能，从而降低DP590热轧钢的DBTT。

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