Liao Yuanlu, Wang Shuqi, Zhang Qiuyang, Wang Lan. Effect of Diffusion Annealing Temperature on the Coating of Hot-dip Aluminized Carbon Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(5): 95-98,104. doi: 10.7513/j.issn.1004-7638.2013.05.019
Citation:
Liao Yuanlu, Wang Shuqi, Zhang Qiuyang, Wang Lan. Effect of Diffusion Annealing Temperature on the Coating of Hot-dip Aluminized Carbon Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(5): 95-98,104. doi: 10.7513/j.issn.1004-7638.2013.05.019
Liao Yuanlu, Wang Shuqi, Zhang Qiuyang, Wang Lan. Effect of Diffusion Annealing Temperature on the Coating of Hot-dip Aluminized Carbon Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(5): 95-98,104. doi: 10.7513/j.issn.1004-7638.2013.05.019
Citation:
Liao Yuanlu, Wang Shuqi, Zhang Qiuyang, Wang Lan. Effect of Diffusion Annealing Temperature on the Coating of Hot-dip Aluminized Carbon Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(5): 95-98,104. doi: 10.7513/j.issn.1004-7638.2013.05.019
Fe-Al intermetallic matrix composite coating was prepared on the surface of steel C45 by hotdip aluminizing,then the sample was processed at different diffusion annealing temperature. The structures and chemical compositions of the coating were analyzed by XRD and SEM etc. The effect of diffusion annealing temperature on alloy layer and the conversion mechanism of the layer was discussed. The results show that the main phases of the coating are Fe2Al and Al2O3 when the temperature is at 700~800℃; as the temperature exceeds 800℃,the phase of the alloy layer varies from brittle phase(Fe2Al5) to tough phases(FeAl and Fe3Al); the alloy layer is completely converted to FeAl and Fe3Al when the diffusion temperature is at 1 000℃. Fe2Al5 is featured by great hardness but it tends to crack due to its brittleness. Although the hardness of FeAl and Fe3Al is lower than that of Fe2A5,their toughness is so excellent that they can effectively hinder the formation and expansion of cracks in the coating,and they can integrate closer with the matrix.