下贝氏体

含Si钢下贝氏体转变初期碳原子的调幅分解

Spinodal decomposition of carbon at initial stage of lower bainite transformation in a Si-containing steel

利用TEM研究了GD钢下贝氏体的组织形态，并探讨了贝氏体的相变机制。

The microstructure of lower bainite in GD steel has been investigated with TEM , and the transformation mechanism of bainite has been studied .

研究了预淬火马氏体对GCr15钢马氏体／下贝氏体（M／B）复合组织及性能的影响。

Effect of pre quenching martensite on the properties of M / B duplex microstructure was studied .

奥氏体低温分解形成下贝氏体中的ε-Fe3C相的价电子结构分析

Valence electron structure analysis of ε - fe_3c in bainite formed by austenite lowtemperature decomposition

GD钢中下贝氏体是由一束贝氏体铁素体片条组成的，而每一片条又是由多个贝氏体相变基元组成。下贝氏体中普遍存在中脊。

It is found that the lower bainite consists of packets of bainite ferrite plates , each plate is composed of several bainite transformation units , Bainite midrib exists generally .

该钢经过900℃，0.5h奥氏体化后空冷，得到非典型上、下贝氏体和块状组织，各种组织中均存在残余奥氏体。

The special upper and lower bainite and lump-like composite structure were obtained in the steel by air cooling after austenitizing at 900 ℃ for 0 . 5h .

用TEM研究了6-5-4-2高速钢经1250℃奥氏体化后于300及250℃等温形成的上、下贝氏体结构，所见两种贝氏体的最终形态都由亚片长大结合而成。

TEM study on 6-5-4-2 High Steed Steel is conducted , thc structure of upper and lower bainites are formed isothermally at 300 and 250 ℃ after austenizing at 1250 ℃ . The final morphology of the two bainites formed result from the sub-plate growth and combination .

可见，通过等温处理获得下贝氏体组织是改善1500MPa级合金结构钢的耐延迟断裂性能的一种有效途径.拉伸强度6.12MPa、断裂伸长率553%；

It can be concluded that isothermal quenching is an effective way to overcome delayed fracture of 1500 MPa level high strength steel .

在铬含量为5%左右、硅含量>2·5%时，碳化物出现了M7C3型，耐磨性也随着增加，该材料的抗冲击磨粒磨损性能最好的是下贝氏体组织。

When the contents of silicon is more than 2.5 % and chromium is 5 % or so , the type of M_ 7 C_ 3 carbide will appear and resistance to wear will increase . The low bainite structure has the best abrasive wear behaviour .

化学不均匀性对粉末烧结钢下贝氏体组织的影响

Influence of Chemistry Inhomogeneity on Lower Bainite of Powder Sintered Steel

贝氏体分上贝氏体和下贝氏体。

Bainite can be classified into upper bainite and lower bainite .

下贝氏体铁素体宽面上的台阶结构

Ledge structure at broad faces of ferrite plates in lower bainite

粉末烧结钢下贝氏体的形成和优化

Formation and optimization of lower bainite in powder sintered steel

借助于图像分析仪分析了下贝氏体转变动力学。

The transformation kinetics of lower bainite was investigated with an image-analyzer .

含硅钢下贝氏体中台阶及残余奥氏体层错的透射电镜观察

Interface ledge and retained austenite faults of lower bainite in silicon containing steels

GCr18Mo轴承钢的下贝氏体组织转变

Lower Bainite Transformation of GCr 18 Mo Bearing Steel

马氏体&下贝氏体复相组织强韧化机理研究及实际应用

Strengthening and Toughening Mechanism of Martensite & Lower Bainite Duplex Structure and its Applications

准下贝氏体的孪晶及形成机制

Twins and its formation mechanism in lower meta-bainite

下贝氏体碳化物源的高温电镜观察

In situ observation of lower bainitic carbides precipitation

下贝氏体碳化物形态及来源

Morphology and Source of Lower Bainitic Carbide

获得复合组织（马氏体加下贝氏体）的热处理工艺

A study on the heating treatment technology for obtaining the composite microstructure of martenite and bainite

在本文中采用在晶界处形成下贝氏体代替晶界优先形成的马氏体的工艺，改善了钢的性能。

So it can be replace martensite with lower bainite in grain boundary to improve steels performance .

含硅钢下贝氏体生长方式&下贝氏体切变增厚

The Growth Mode of Lower Bainite in Silicon Containing Steel & The Shear Thickening of Lower Bainite

准下贝氏体相变研究

Quasi Lower Bainitic Transformation

上贝氏体在奥氏体晶界形核，随等温处理的温度降低，下贝氏体在奥氏体晶内形核。

Upper bainite nucleated at austenite grain boundary , and with austempering temperature decreased lower bainite nucleated at grain inner .

电镜分析指出，复相组织疲劳性能高的原因是复相组织中的下贝氏体回火后析出短杆状碳化物，能有效地阻止疲劳裂纹的萌生及扩展。

TEM analysis reveals that the precipitation of short-bar-shaped carbides in lower-bainite can prevent effectively from initiation and propagation of fatigue cracks .

低碳合金钢的中温转变组织主要有兰类，即粒状组织、上贝氏体和下贝氏体。

Three types microstructures are formed at intermedium temperature in the low carbon alloy steels , that is granular structure , upper and lower bainite .

少量准下贝氏体与低碳马氏体的混合组织具有最佳的强韧性配合。

And the complex structure of small quantity of lower meta-bainite together with dominant low carbon martensite is of the best match of strength and toughness .

结果表明：经880℃奥氏体化＋320℃等温淬火处理，可获得上贝氏体／下贝氏体的混合组织。

The results show that the upper bainitie / lower bainitic mixture matrix can be obtained under the condition : 880 ℃ Austeniting + 320 ℃ Austempering .

显微组织为回火板条马氏体+下贝氏体+残余奥氏体+弥散碳化物，该组织是耐磨钢与破碎机原衬板相比较，机械性能提高的主要原因。

The Microstructure is tempered martensite + bainite + retained austenite + carbide dispersion . The microstructure is the main reason of the good comprehensive mechanical properties .