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板条 M(马氏体)A(奥氏体)化时,在其基体上有条状 A 形成。有人认为是M 型逆转变,也有人认为是通过扩散方式形成的.弄清这一相变性质,对研究逆转A 的后期合并方式、加热速度对晶粒大小的影响,以及在控制轧制方面的应用等,都具有重要意义.为此,本文用 LM、TEM、SEM 及 X-线衍射等方法,观察分析了10CrNi5MoV 钢板条 M 经不同温度再加热处理后的组织及逆转 A 的形成、分布、形貌、稳定性等问题.从而得出结论:①再加热温度相当于高回火温度时,组织为回火 M+A;在两相区加热时,光学显微组织中的白色条状为铁素体,深色易蚀组织为 M-A 相与未相变的铁素体构成的复合组织;②低于 Ac_1时,M→A 的逆转变开始.在630～700℃之间,板条 M 生成不同稳定程度的 A,随温度升高 A 量有最大值;③板条 M 经再加热所形成的逆转 A,在电镜下观察有块状及条状两种:在原晶界等处析出块状 A;在 M 板条间析出条状 A.本钢种的条状 A 是以扩散方式形成的,并随再加热温度的升高而合并成新晶粒.
When the strip M (martensite) A (austenite) is formed, a strip A is formed on its base. Some people think that the inverse of M-type, some people think that is formed by the proliferation of ways to understand the nature of the phase change, the study reversed A late merger, the heating rate on the grain size, as well as in the control of rolling The application and so on are of great significance.In this paper, the formation and distribution of the microstructure and the reversal A of the 10CrNi5MoV steel strip M after reheating at different temperatures were observed and analyzed by LM, TEM, SEM and X-ray diffraction. , Morphology, stability and other issues.Thus concluded: ① reheating temperature is equivalent to high tempering temperature, the organization for the tempering M + A; heating in the two-phase region, the optical microstructure of the white strip Is ferrite, dark erodible microstructure composed of MA phase and non-transformed ferrite composite structure; ② below Ac_1, M → A reverse transformation begins at 630 ~ 700 ℃ between the slats M generated a different degree of stability of A, with the increase of temperature A has the maximum value; â ’¢ slab M after reheating the formation of the reversal of A, under electron microscopy there are two blocks and strips: precipitation in the original grain boundary Lumps A; strips strip A between M slats A. Strip A of the present steel strip is diffused Into, and then heated with increasing temperature into a new die.