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通过在1260℃进行的保温实验,研究了Mn-Cu耐候钢的龟裂现象.结果表明,在氧化气氛中经过不同时间高温保温处理,Mn-Cu耐候钢表层均出现了不同程度的龟裂.EPMA结果表明,Cu在基体/氧化皮界面区出现富集,Cu在珠光体中的含量高于铁素体.Mn-Cu耐候钢在高温保温过程中表层发生的脱碳现象导致脱碳层中珠光体析出数量减少,致使过多的Cu在晶界析出偏聚、形成富Cu相,进而加剧钢的表面龟裂.在还原气氛中高温保温处理后,没有发现Mn-Cu耐候钢出现上述现象.
Cracking of Mn-Cu weathering steels was studied at 1260 ℃, and the results showed that different degrees of cracks appeared on the surface of Mn-Cu weathering steels in different time and high temperature in the oxidizing atmosphere. EPMA results show that the enrichment of Cu in the substrate / scale interface area, the content of Cu in the pearlite is higher than that of ferrite.Mn-Cu weathering steel in the high temperature insulation process surface decarburization phenomenon led to the decarburization layer Decreasing the amount of pearlite precipitation, resulting in excessive precipitation of Cu in the grain boundary segregation, the formation of Cu-rich phase, thereby exacerbating the surface cracking of steel in a reducing atmosphere after high temperature heat treatment, Mn-Cu weathering steel did not find the above phenomenon .