摘要
本文研究了G-X12CrMoWVNbN10 11钢在700℃长时间等温处理过程中的组织演变。通过DTA曲线,分析得到该钢种在加热和冷却过程中的各相转变温度。采用光学显微镜、扫描电镜和能谱分析,研究不同时间等温处理后的组织。结果表明:M_3C型碳化物优先在原奥氏体晶界附近析出,此后,碳化物聚集长大导致出现两相区。随着等温处理时间的增加,两相区的转变量近似以S形规律增加,基体硬度则线性降低。
In order to clarify the microstructural evolution of G-XI2CrMoWVNbNI0 1 1 steel during long-term isothermal heat treatment in detail, many specimens treated with different holding time isothermally at 700℃ were investigated in this paper. Several critical transformation temperatures of G-X12CrMoWVNbN 10 1 1 steel during heating and cooling, such as Acb Ac3 and Ms, were determined by evaluating its DTA curves. In the long-term isothermal heat treatment at 700℃, M3C-type complex carbides preferentially precipitated in the vicinity of prior austenite grain boundaries, and then the carbides conglomerated and grew, which resulted in the appearance of two-phase zones comprised of ferrites and carbides. The amount of two-phase zones increased nearly by a sigmoid law with the holding time increasing. Meanwhile, hardness of the matrix decreased linearly, because the carbon and alloying elements dissolved in the matrix were consumed by precipitation of carbides, which deteriorated the solution strengthening effect by these elements.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第B08期5-8,13,共5页
Transactions of Materials and Heat Treatment
