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本文研究了马氏体结构形态的转变特征。指出:马氏体中固溶碳在≤0.60%时,光镜下的结构形态主要是板条状、块粒状、柱状、块状、均属低碳马氏体;固溶碳在≥0.60%时,马氏体晶体呈互不平行的针片状,或薄片状,均属高碳马氏体。低碳马氏体具有很高的强韧性,其使用寿命优于高碳马氏体。本文结合结构形态的电镜研究证实:板条状、柱状、块粒状和蝶状等马氏体的亚结构多属位错,但板条状马氏体中也发现有孪晶。在针片状和薄片状马氏体中,虽大多属于孪晶亚结构,但在薄片状马氏体中,却发现有位错,而在针片状马氏体中也有并非孪晶者。文内对影响马氏体结构形态的16因素进行阐述,并对低碳马氏体的强韧特性作了论证。
In this paper, the transformation of martensite structure morphology is studied. It is pointed out that the structure morphology of martensite in ≤0.60% martensite is mainly lath, block granular, columnar and massive, which belongs to low carbon martensite. The content of solid solution carbon in ≥0.60% When the martensite crystals are not parallel to each other needle-shaped, or flaky, are high-carbon martensite. Low-carbon martensite has high toughness, its service life is superior to high-carbon martensite. In this paper, the structural morphology of electron microscopy studies confirmed that: lath, columnar, block granular and butterfly martensite substructure mostly belong to dislocation, but also found in lath martensite twins. Although most of the needle-like and lamellar-shaped martensite belong to the twin sub-structure, dislocations are found in the lamellar martensite but not in the needle-like martensite. This paper expounds 16 factors that affect the morphology of martensite structure and demonstrates the toughness of low carbon martensite.