Influence of annealing conditions on the galvanizability and galvannealing properties of TiNb interstitial-free steels, strengthened with phosphorous and manganese

被引:60
作者
Hertveldt, I [1 ]
De Cooman, BC
Claessens, S
机构
[1] State Univ Ghent, Lab Iron & Steelmaking, B-9052 Ghent, Belgium
[2] State Univ Ghent, Dept Met & Mat Sci, B-9052 Ghent, Belgium
[3] OCAS NV, SIDMAR, R&D Ctr, ARBED Grp,Flat Rolled Prod Div, B-9060 Zelzate, Belgium
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2000年 / 31卷 / 04期
关键词
Material Transaction; Steel Surface; Subsurface Region; Recrystallization Annealing; Glow Discharge Optical Emission Spectroscopy;
D O I
10.1007/s11661-000-0118-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A high-strength interstitial-free (HS IF) steel, solution strengthened with P and Mn, was hot-dip galvanized and galvannealed in a laboratory hot-dip simulator. The dew point of the N-2-H-2 annealing atmosphere during recrystallization was varied, and the effect of the dew-point changes on the galvannealing kinetics was studied. Annealing in a high-dew-point N-2-H-2 atmosphere improved the wettability by the zinc and the galvannealing reactivity of the Mn-P-added IF steels considerably. Scanning electron microscopy (SEM) analysis and glow discharge optical emission spectroscopy (GDOES) depth profiles of the surface of the steel sheet and the subsurface region revealed clear differences in oxidation mode after recrystallization annealing. Plane-view SEM and transmission electron microscopy (TEM) analyses were done on the inhibition layer of the as-galvanized samples. Differences in the Mn and P contents were found. By analyzing the Mn and P contents in the coatings during galvannealing, a mechanism was proposed to explain the higher galvannealing reactivity which is observed when the dew point during recrystallization annealing is increased.
引用
收藏
页码:1225 / 1232
页数:8
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