MI Fengyi
,
WANG Xiangdong
,
LIU Zhipu
,
WANG Bing
,
PENG Yun
,
TAO Dongping
钢铁研究学报(英文版)
The corrosion behavior of lowcarbon steel (CS), Pbearing steel (PS) and PRE weathering steel (PREWS) exposed for two years in Jiangjin of China was investigated. The results showed that during 2year exposure test, corrosion data of the experimental steels followed the bilogarithmic equation, and the average corrosion depth of PS and PREWS was decreased by 195% and 282% respectively compared with that of CS. Scanning electron microscope, electrochemical impedance spectroscope and Fourier transform infrared spectroscope were used to characterize the corrosion products. The research results showed that P in steel could promote the formation of an amorphous ferric oxyhydroxide layer near the substrate. The addition of RE could effectively increase the charge transportation resistance of rust.
关键词:
weathering steel
,
industrial atmosphere
,
rust layer
,
synergistic effect
张春玲，蔡大勇，廖波
钢铁
在商用09CuPCrNi耐候钢化学成分的基础上，通过调整合金元素含量，研制出了可直接热轧双相化的Cu-P-Cr-Ni-Mo耐候钢。该钢种变形奥氏体的CCT曲线具有较宽的铁素体析出区，可作为热轧“可行的速度窗口”；铁素体析出区与贝氏体转变区之间存在约80℃的奥氏体亚稳区，可作为热轧“可行的卷取范围”；贝氏体转变区的右侧端部封口，可避免在卷取过程中发生贝氏体转变。根据Cu-P-Cr-Ni-Mo耐候钢的变形奥氏体的CCT曲线，制定了5种热轧双相化工艺，并采用Gleeble-3500热模拟机进行了轧制模拟，制备出了Cu-P-Cr-Ni-Mo热轧双相耐候钢。不同工艺下获得的双相耐候钢组织均为铁素体基体及其上呈岛状分布的马氏体，马氏体体积分数为17%~28%。
关键词:
耐候钢
,
CCT diagram
,
metastable austenite
,
hot-rolled dual-phase treatment
