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Effect of normalization temperatures on ductile-brittle transition temperature of a modified 9Cr-1Mo steel

机译：正火温度对9Cr-1Mo改性钢韧性-脆性转变温度的影响

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A modified 9Cr-1Mo steel has been exposed to three separate normalization treatments i.e. at 950 ℃, 1025 ℃ and 1100 ℃ from As-received (normalized at 1050 ℃ and tempered at 750 ℃) condition. After subsequent tempering treatment the impact toughness in terms of upper shelf energy (USE) and ductile-to-brittle transition temperature (DBTT) has been evaluated using Charpy impact testing (with 10 mm × 10 mm × 55 mm specimens) following ASTM E23 procedures. A substantial improvement in USE (～20 J) and reduction in DBTT (～20 ℃) has been noticed for the 1025 ℃ treatment. The result has been analysed in terms of change in yield strength and ductility evaluated with tensile tests. Further, effects of microstructure, precipitate and texture on the change of DBTT have been studied with TEM and EBSD analyses. The results have been attributed to the smaller 'effective grain size', higher fraction of high-angle boundaries, presence of beneficial γ-fibre texture and dissolution of the pre-existing coarse precipitates in the reheated sample as compared to As-received material.
机译：改性的9Cr-1Mo钢已从收到的As（在1050℃进行正火，在750℃回火）的状态分别经受了950℃，1025℃和1100℃的三种单独的正火处理。在随后的回火处理后，按照ASTM E23程序，使用夏比冲击试验（10毫米×10毫米×55毫米试样），根据上架能量（USE）和韧性至脆性转变温度（DBTT）评估了冲击韧性。 。对于1025℃处理，已注意到USE（〜20 J）的大幅改善和DBTT（〜20℃）的降低。通过屈服强度和延展性变化的拉伸试验评估了结果。此外，已经通过TEM和EBSD分析研究了微观结构，沉淀和织构对DBTT变化的影响。该结果归因于与接收到的材料相比，“有效晶粒尺寸”更小，高角度边界的比例更高，有益的γ纤维质地的存在以及再加热样品中先前存在的粗大沉淀的溶解。

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