Yield Strength Enhancement by Carbon Trapping in Ferrite of the Quenching and Partitioning Steel
Yield Strength Enhancement by Carbon Trapping in Ferrite of the Quenching and Partitioning Steel
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淬火分配钢铁素体中碳的捕获提高屈服强度
DOI：
10.1007/s11661-017-4364-7
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发表时间：
2018-01-01
影响因子：
2.8
通讯作者：
Yi, H. L.
中科院分区：
文献类型：
--
作者：
Chen, P.;Wang, G. D.;Yi, H. L.
分裂淬火和分配（S-QP）过程允许研究人员分别研究微观结构和性能，即，在分割之前和之后在配分过程之后，含铁素体的δ-淬火和配分（δ-QP）钢的屈服强度增加约300 MPa。我们认为碳在配分过程中被捕获在铁素体晶界的位错中是铁素体屈服强度提高的原因。结合透射电子显微镜和三维原子探针断层扫描观察表明，碳原子在位错中分离。首次阐明了铁素体型QP钢高屈服强度的机理。
The split quenching and partitioning (S-QP) process allows researchers to investigate microstructure and properties separately,i.e., before and after partitioning. After the partitioning process, the yield strength increases by approximately 300 MPa in the ferrite-bearingδ-quenching and partitioning (δ-QP) steel. We propose that carbon trapping in dislocations at the ferrite grain boundaries during partitioning process is responsible for the yield strength enhancement of ferrite. Combined transmission electron microscopy and 3D atom probe tomography observations demonstrate carbon atoms segregating in dislocations. The mechanisms for the high yield strength of ferrite presented QP steels are clarified for the first time in this research.