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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Boron and Carbon on the Fracture Toughness of IN 718 Superalloy at Room Temperature and 650 de C
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Effect of Boron and Carbon on the Fracture Toughness of IN 718 Superalloy at Room Temperature and 650 de C

机译：硼和碳对室温和650℃下IN 718高温合金断裂韧性的影响

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摘要

The effect of B and C microadditions on the fracture toughness of IN 718 superalloy was investigated at room temperature (RT) and at 650 deg C At RT, the fracture toughness was observed to increase with increasing B and C concentrations. C had a relatively weak effect on the fracture toughness at 650 deg C, but the influence of B was significant. At RT the highest fracture toughness value was obtained for the alloy with 29 ppm B and 225 ppm C at RT, and at 650 deg C the alloy with 60 ppm B and 40 ppm C had the highest fracture toughness. An increase in the concentration of B to 100 ppm, however, resulted in a reduction in the fracture toughness at 650 °C. Fractographic observations showed that the formation and coalescence of microvoids was the predominant fracture mechanism at RT. In contrast, at 650 deg C, the fracture surface exhibited intergranular cracking in the alloy with lower B concentrations and transgranular cracking coupled with fine dimples in the alloy with higher B concentrations. It is suggested that B impedes intergranular cracking by increasing the cohesion of grain boundaries and improving the grain boundary stabilization. The RT increase in the fracture toughness of the material caused by the addition of C is attributed to the formation of intergranular and intragranular carbides that increased the resistance to the plastic deformation.
机译：在室温（RT）和650℃下研究了B和C微量添加对IN 718高温合金断裂韧性的影响。在RT下，观察到断裂韧性随B和C浓度的增加而增加。 C对650℃下的断裂韧性的影响相对较弱，但是B的影响很大。在室温下，对于具有29 ppm B和225 ppm C的合金，在室温下可获得最高的断裂韧性值，而在650摄氏度下，具有60 ppm B和40 ppm C的合金具有最高的断裂韧性。但是，将B的浓度增加至100ppm会导致650℃的断裂韧性降低。断口观察表明，微孔的形成和聚结是室温下的主要断裂机理。相反，在650摄氏度时，断裂表面在B浓度较低的合金中表现出晶间裂纹，而在B浓度较高的合金中，晶界裂纹与细小凹坑相伴。建议通过增加晶界的内聚力和改善晶界的稳定性来阻止晶间开裂。由于添加C导致材料断裂韧性的RT升高归因于晶间和晶内碳化物的形成，从而增加了对塑性变形的抵抗力。

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