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用Mossbauer谱学对新型高强高韧钢G99在不同温度回火后的超精细场变化进行了研究．用透射电镜和电子衍射分析了合金碳化物的析出．结果表明，G99钢中超精细场分布、碳化物和奥氏体量都随着回火温度的升高而变化主要是由于在回火过程中回火马氏体内Fe－Co，Fe-Ni近邻增多，Fe－Cr,Fe－Mo近邻减少，渗碳体的溶解与合金碳化物的析出以及残余奥氏体转变与逆转奥氏体的产生所致．合金碳化物的弥散析出和少量逆转奥氏体的产生以及Co，Ni原子在回火马氏体中的均匀分布是G99钢具有优良的强韧性配合的重要因素．
The Mossbauer spectroscopy was used to study the hyperfine field changes of a new type of high strength and toughness steel G99 after tempering at different temperatures. The precipitation of alloy carbides was analyzed by transmission electron microscopy and electron diffraction. The results show that the distribution of hyperfine field, the amount of carbides and austenite in G99 steel all change with the increase of tempering temperature, which is mainly due to the increase of Fe-Co and Fe-Ni in tempered martensite during tempering , Fe-Cr, Fe-Mo neighbor decreases, the dissolution of cementite and the precipitation of alloy carbides, as well as the residual austenite transformation and the reversal of austenite generation. The dispersion and precipitation of alloy carbides and the generation of a small amount of reverse austenite and the uniform distribution of Co and Ni atoms in tempered martensite are important factors for the excellent toughness of G99 steel.