Mn-Cu耐候钢的表面龟裂
收稿日期: 2009-07-21
修回日期: 2009-11-13
网络出版日期: 2010-06-11
基金资助
国家重点基础研究发展计划项目2004CB619101与国家自然科学基金项目50499336和50971120资助
SURFACE CRAZING OF Mn–Cu WEATHERING STEEL
Received date: 2009-07-21
Revised date: 2009-11-13
Online published: 2010-06-11
Supported by
Supported by National Basic Research Program of China (No.2004CB619101) and National Natural Science Foundation of China (Nos.50499336 and 50971120)
王雷 . Mn-Cu耐候钢的表面龟裂[J]. 金属学报, 2010 , 46(6) : 723 -728 . DOI: 10.3724/SP.J.1037.2009.00501
Craze cracks and oxidation appeared on the surfaces of the Mn–Cu weathering steel samples after different soaking times at 1260 ℃in the oxidizing conditions. EPMA result shows that Cu enriches at the interface of matrix/scale, Cu concentration in pearite is higher than that in ferrite. OM observaion shows that decarbonization phenomenon occurred near surface of steel after soaking in high temperature experiments, which resulted in an obvious decrease of pearlite amount, so more Cu segregation in grain oundaies and formed Cu–enriched phase, and caused serous surface crazing at last. Hoever, under the educing conditionthe craze crack phenomenon did not occur after soaking
Key words： Mn-Cu weathering steel; surface crazing; soaking; decarbonization
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