摘要
含硅钢在贝氏体温区短时等温获得了准贝氏体组织：贝氏体铁素体（ＢＦ）＋残余奥氏体（Ａ_Ｒ）．ＢＦ中具有Ｓｐｉｎｏｄａｌ分解现象，类似于马氏体时效的早期现象，结合Ｘ射线衍射法定量测定结果，证明ＢＦ过饱和碳．ＢＦ／Ａ_Ｒ相界面位错是以混合位错为主的位错圈．ＢＦ中含有高密度位错和孪晶，而Ａ_Ｒ中缺陷主要为层错和孪晶，层错面或孪晶面与界面台阶有对应关系，表明阶面不会沿界面宽面侧向移动．根据实验结果提出了贝氏体铁素体在贫碳区中受碳原子扩散控制的位错圈沿缺陷面切变形成的三维模型．
The meta-bainite which is composed of bainitic ferrite(BF) and retained austenite(A_R) was obtained in silicon-containing steels held in the temperature range of bainite formation for a short time. It was confirmed that BF is supersatuated with carbon by the facts that Spinodal decomposition occurs in BF and that the quantitative data of carbon content in BF was obtained by a new equation based on the X-ray diffraction data. The dislocation loops at BF/A_R boundary, which is very similar to that of lath martensite, and stacking faults in A_R and twins in BF were found by TEM. Based on the results, a three-dimensional model of hainite shear formation controlled by diffusion of carbon was suggested.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第9期897-903,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
贝氏体
相变
碳含量
界面
位错
硅钢
silicon-containing steel
bainite
phase transformation
carbon content
interfacial dislocation
