无Co超高强高韧马氏体钢回火微观结构的穆斯堡尔谱  

Mssbauer Spectrum Study on the Microstructures of Cobalt-Free Superhigh Strength High Fracture Toughness Steel During Tempering Process

作　　者：张国英[1] 钱存富[1] 曾梅光[1] 李荣[2] 

机构地区：[1]东北大学理学院 [2]北京钢铁研究总院,北京100081

出　　处：《东北大学学报（自然科学版）》2002年第1期45-48,共4页Journal of Northeastern University(Natural Science)

基　　金：国家"九五"科技攻关项目 (98 A2 8 0 1 0 2 )

摘　　要：用M ssbauer谱学对新型无Co高强高韧钢在不同温度回火后的超精细场分布进行了研究 ,得出了合金元素的分布 ,碳化物和奥氏体量随回火温度的变化规律· 结果表明 ,新型无Co高强高韧钢在低温回火阶段析出的主要是ε碳化物 ,且随回火温度的升高析出量增加 ,这增强了抵抗回火软化的能力· 残余奥氏体量随回火温度的升高略有分解 ,不过奥氏体量仍较高从而提高了钢的韧性·随着回火温度升高 ,合金元素分布有所不同 ,其中在 2 2 0℃以上回火 ,Fe C Ni(1)原子组态有明显增加 。The distribution of hyperfine field H hf (T) during the tempering process of new Cobalt free steel of high strength and high fracture toughness was studied by Mssbauer spectroscopy. The distribution of alloying elements, the law of the variation of the quantity of ε carbides and remained austenite were obtained. The ε carbides precipitates, when steel is tempered at low temperature. The quantity of ε carbides increases with tempering temperature going up, which resists the softening of steel during the tempering process. A part of remained austenite resolves during tempering process, but the existing of remained austenite in steel may account for the excellent toughness exhibited by Co free steels of high strength and high fracture toughness. The distribution of alloying elements is influenced by tempering temperature. The atom configuration of Fe C Ni(1) obviously increases, when the tempering temperature is above 220?℃, which results in the yield strength going up.

关 键 词：合金元素分布 微观组织 超精细场 高强韧钢 马氏体钢 回火 穆斯堡尔谱 

分 类 号：TG142.24[一般工业技术—材料科学与工程] TG151.2[金属学及工艺—金属材料]