The influence of the oxygen equivalent in a gas-mixture on the structure and toughness of microalloyed steel weldments

被引：6

作者：

Prokic-Cvetkovic, R ^{[1
]}

Milosavljevic, A ^{[1
]}

Sedmak, A ^{[1
]}

Popovic, O ^{[1
]}

机构：

[1] Fac Mech Engn, Belgrade, Serbia Monteneg

来源：

JOURNAL OF THE SERBIAN CHEMICAL SOCIETY | 2006年 / 71卷 / 03期

关键词：

oxygen equivalent; toughness; microalloyed steel; gas mixture; fracture;

D O I：

10.2298/JSC0603313P

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Testings were carried out on two steels. The first was microalloyed with Nb and second with Ti, Nb and V The impact toughness of weld metals of these steels was evaluated using an instrumented Charpy pendulum. Five different gas mixtures (Ar, CO2, O-2) were used to determine the optimal gas shielded metal are process for both steels. The oxygen equivalent was used as a representative parameter of a mixture to follow, in particularly, its effect on the microstructure, toughness and crack propagation energy of the weld metal. For these investigated steels, the optimum gas mixture was established (5% CO2, 0.91% O-2, balance Ar), which provided the maximum crack propagation energy, due to the microstructure which consisted dominantly of acicular ferrite.

引用

页码：313 / 321

页数：9