SITE COMPETITION BETWEEN SULFUR AND CARBON AT GRAIN-BOUNDARIES AND THEIR EFFECTS ON THE GRAIN-BOUNDARY COHESION IN IRON
SITE COMPETITION BETWEEN SULFUR AND CARBON AT GRAIN-BOUNDARIES AND THEIR EFFECTS ON THE GRAIN-BOUNDARY COHESION IN IRON
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DOI：
10.1007/bf02668560
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发表时间：
1987-06-01
期刊：
影响因子：
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通讯作者：
KIMURA, H
中科院分区：
文献类型：
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作者：
SUZUKI, S;TANII, S;KIMURA, H
本文用俄歇电子能谱（AES）研究了含硫100 wtppm、含碳90 wtppm的铁硫碳合金的晶界偏聚。结果表明，硫和碳的偏聚在晶界上产生了位压缩。硫的偏聚能估计为75 kJ/mol。对这些合金进行了冲击试验。含碳量小于20 wt ppm的铁硫合金以具有高韧脆转变温度（DBTT）的晶间模式断裂。添加高达90重量ppm的碳的二元合金防止晶界偏析的硫所造成的沿晶断裂，并降低DBTT。当碳偏析到晶界时，将硫驱离晶界，并且还增加晶界内聚性。根据硫和碳的晶界偏聚程度分析了铁硫碳合金的DBTT值。结果表明，在晶界偏聚程度相同的情况下，硫对铁的晶界结合力的降低比磷更严重。
Grain boundary segregation in iron-sulfur-carbon alloys containing up to 100 wt ppm sulfur and up to 90 wt ppm carbon has been investigated with Auger electron spectroscopy (AES). The results show the site compctition on grain boundaries between the segregation of sulfur and carbon. The segregation energy of sulfur is estimated to be 75 kJ/mol. Impact tests of these alloys were carried out. Iron-sulfur alloys with less than 20 wt ppm carbon fractured by the intergranular mode with high ductile-brittle transition temperatures (DBTT’s). Addition of up to 90 wt ppm carbon to the binary alloys prevented the intergranular fracture caused by the grain boundary segregation of sulfur, and decreased the DBTT. Carbon, when segregated to grain boundaries, drives sulfur away from the boundaries and also increases the grain boundary cohesion. The DBTT values of the iron-sulfur-carbon alloys are analyzed in terms of the degree of grain boundary segregation of sulfur and carbon. It is shown that sulfur decreases the grain boundary cohesion of iron more severely than phosphorus if compared at the same degree of grain boundary segregation.