The results show that the microstructure was mainly composed of martensite and lower-bainite.
结果表明，实验钢的组织以马氏体和下贝氏体为主。
TEM analysis reveals that the precipitation of short-bar-shaped carbides in lower-bainite can prevent effectively from initiation and propagation of fatigue cracks.
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。
The intermedium temperature microstructure of medium carbon alloy steel is upper and lower bainite.
中碳合金钢的中温转变组织只有上、下贝氏体。
The increase of weld current can reduce the hardness and the content of upper bainite, and lower the sensibility of hydrogen cracking of the joints.
在避免烧穿的前提下增大焊接电流能够减小硬度、减少上贝氏体，从而降低氢致开裂敏感性。
The lower dislocation density in bainite is unfavourable for the aggregation and coarsening of carbides.
贝氏体中位错密度较低，不利于合金碳化物的聚集粗化。
The experimental result shows that the cracking resistance can be increased effectively as dual-phase structure existed in the layer consisting of lower bainite and lath martensite.
试验证明，当焊缝组织为下贝氏体及板条马氏体双相组织时，能有效地提高焊条的抗裂性能。
The transformation kinetics of lower bainite was investigated with an image-analyzer.
借助于图像分析仪分析了下贝氏体转变动力学。
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.
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。
Holding in the lower pearlite range accelerates subsequent transformation to bainite.
下珠光体区停留促进贝茵体的形核过程。
Holding in the lower pearlite range accelerates subsequent transformation to bainite.
下珠光体区停留促进贝茵体的形核过程。
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