Yongfeng Zheng, Xiaofeng Hu, Haichang Jiang, Lijian Rong
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引用次数: 0
摘要
30Cr2Ni4MoV 钢在高温服役期间的时效脆性被归因于晶界（GB）上的硅和锰偏析。我们报告了 30Cr2Ni4MoV 钢老化脆化的另一种机制。利用原子探针断层扫描技术，我们发现淬火和回火（QT）后的 30Cr2Ni4MoV 钢在晶界处已含有明显的 Si 和 Mn 偏析，这意味着晶界处的 Si 和 Mn 偏析不足以诱发时效脆化。首次发现在时效 30Cr2Ni4MoV 钢中沿 GB 新析出许多 G 相，而 QT30Cr2Ni4MoV 钢 GB 上的 Si 和 Mn 偏析是 G 相析出的主要原因。硬而脆的 G 相有助于促进冲击变形过程中的裂纹萌生。随后，由于 G 相的分布以及 Si 和 Mn 沿 GB 的偏析，裂纹可沿 GB 快速扩展，从而导致晶间开裂和低冲击能，与时效 30Cr2Ni4MoV 钢相同。
New Insights into the Aging Embrittlement Mechanism of 30Cr2Ni4MoV Steel Containing Si and Mn
The aging embrittlement of 30Cr2Ni4MoV steel during service at high temperature has been attributed to the segregation of Si and Mn at grain boundary (GB). We report an alternative mechanism of aging embrittlement of 30Cr2Ni4MoV steel. Using atom probe tomography, it is found that the quenched and tempered (QT) 30Cr2Ni4MoV steel has already contained obvious Si and Mn segregations at GB, which means that the Si and Mn segregations at GB are not sufficient to induce aging embrittlement. It is discovered for the first time in aged 30Cr2Ni4MoV there newly precipitate many G-phases along GB, and Si and Mn segregations at GB of QT30Cr2Ni4MoV steel are the main reason for the precipitation of G-phase. The hard and brittle G-phase helps to promote crack initiation during impact deformation. Subsequently, the cracks can rapidly propagate along GB due to the distribution of G-phase and the segregation of Si and Mn along the GB, which leads to intergranular cracking and low impact energy as for aged 30Cr2Ni4MoV steel.
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