Themicrostructure of bonded zone consist of upper bainite and grain boundary ferrite.
接合部组织由晶界铁素体及晶内上贝氏体组成。
The upper bainite transformation has not only essential difference but also intimate relation with pearlite decomposition;
上贝氏体转变与珠光体分解有着本质上的区别，但又有密切的联系；
With large welding heat input, more upper Bainite and granular Bainite form, which is benefit to improve the property of HAZ.
采用大的线能量焊接，形成较多的上贝氏体和粒状贝氏体组织，对改善接头性能有利。
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 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 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。
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