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前言15Mn26Al4是我国自行研制的低温用钢。在研制过程中曾发现其高温冲击性能随镁含量增高而降低。镁含量为0.01%时,其断口呈明显的塑性韧窝状断裂特征,而当镁的含量为0.03%时,则为典型的脆性沿晶断裂。材料研究工作者为了探讨断裂机制,考察这种脆性断裂是否与镁沿晶界富集有关,而要求对断口成分进行分析。由于俄歇电子能谱仪对低含量镁的测定灵敏度不高,我们根据无火焰原子吸收光谱分析具有用样量少,绝对灵敏度高等特点,研究并建立了化学浸蚀-无火焰原子吸收法测定铁锰
Foreword 15Mn26Al4 is developed by our own low-temperature steel. In the development process has been found that the high temperature impact properties with the magnesium content decreased. When the content of magnesium is 0.01%, the fracture is obviously ductile fracture, while when the content of magnesium is 0.03%, it is a typical brittle intergranular fracture. In order to investigate the mechanism of fracture and to investigate whether this brittle fracture is related to the enrichment along the grain boundaries with magnesium, materials researchers are required to analyze the fracture composition. Due to the low sensitivity of Auger electron spectroscopy to determination of low content of magnesium, we have studied and established the chemical etching - flameless atomic absorption spectrometry (FAAS) based on flameless atomic absorption spectrometry with less sample and higher absolute sensitivity. Iron manganese