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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Normalizing Temperature on Fracture Characteristic of Tensile and Impact Tested Creep Strength-Enhanced Ferritic P92 Steel
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Effect of Normalizing Temperature on Fracture Characteristic of Tensile and Impact Tested Creep Strength-Enhanced Ferritic P92 Steel

机译：测定温度对拉伸抗冲击性裂缝特性的效果蠕变强度增强铁素体P92钢

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摘要

The high-temperature Cr-Mo creep strength-enhanced ferritic (CSEF) steels are mainly used in nuclear and thermal power plants. In the present investigation, a systematic study on fracture surface morphologies of tensile and impact tested specimens and mechanical properties of cast and forged (C&F) P92 steel was performed for various heat treatment conditions. The heat treatment was carried out in normalizing temperature range of 950-1150 degrees C and then tempered to a fixed tempering temperature of 760 degrees C. The effect of varying normalizing temperatures before and after tempering on microstructure evolution, tensile properties, Vicker's hardness and Charpy toughness was studied. The normalizing temperature before and after tempering was having a noticeable effect on mechanical properties of as-received P92 steel. The fracture surface of impact and tensile tested samples was also studied for various normalizing temperatures with or without tempering. Fracture surface morphology was affected by the presence of secondary phase carbide particles. The fraction area of cleavage facets on the tensile fracture surface was found to be increased with an increase in the normalizing temperature. The fractured tensile specimens were characterized by transgranular ductile dimples, tear ridges and transgranular cleavage facets for various heat treatments. The fracture mode of impact tested samples was more complex. It showed both quasi-cleavage facets and ductile dimple tearing for various normalizing temperatures.
机译：高温CR-MO蠕变强度增强铁素体（CSEF）钢主要用于核和火力发电厂。在本研究中，对各种热处理条件进行了抗拉和冲击测试试样的裂缝表面形态和铸造和锻造（C＆F）P92钢的力学性能的系统研究。在950-1150℃的归一化温度范围内进行热处理，然后回火至760℃的固定回火温度。在微观结构演化，拉伸性能，维氏硬度和夏奇地区和高温下，改变归一化温度的效果。研究了韧性。回火前后的归一化温度对接收的P92钢的机械性能具有显着影响。还研究了抗冲击和拉伸试验样品的裂缝表面，用于各种标准化温度，具有或不带回火。裂缝表面形态受第二相碳化物颗粒的存在影响。发现拉伸骨折表面上的裂解刻面的馏分面积随着标准化温度的增加而增加。骨折的拉伸样品的特征在于，用于各种热处理的响细胞延性凹槽，撕裂脊和旋转骨折剖面。冲击试验样品的裂缝模式更复杂。它显示了各种标准化温度的准切割刻面和韧性凹槽。

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