Nanoscale precipitates and comprehensive strengthening mechanism in AISI H13 steel
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- 作者：Wen-wen Mao ; An-gang Ning ; Han-jie Guo
- 关键词：die steel ; precipitates ; strengthening ; dislocation
- 刊名：International Journal of Minerals, Metallurgy, and Materials
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：23
- 期：9
- 页码：1056-1064
- 全文大小：2,571 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science
Metallic Materials
Mineral Resources - 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
- ISSN：1869-103X
- 卷排序：23
文摘
The effects of heat treatment on the precipitates and strengthening mechanism in AISI H13 steel were investigated. The results showed that the presence of nanoscale precipitates favorably affected grain refinement and improved the yield strength. The volume fraction of precipitates increased from 1.05% to 2.85% during tempering, whereas the average precipitate size first decreased then increased during tempering. Contributions to the yield strength arising from the various mechanisms were calculated quantificationally, and the results demonstrated that grain refinement and dislocation density most strongly influenced the yield strength. In addition, under the interaction of average size and volume fraction, precipitates’ contribution to the yield strength ranged from 247.9 to 378.5 MPa. Finally, a root-mean-square summation law of σ = σg + σs + (σd2 + σp2)1/2, where σg, σs, σd, and σp represent the contributions of fine-grain strengthening, solid-solution strengthening, dislocation strengthening, and precipitation strengthening, respectively, was confirmed as the most applicable for AISI H13 steel, which indicates a strong link between precipitates and dislocations in AISI H13 steel.