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Phenomenon on strain-induced precipitation and coarsening of carbides in H13 at 700 °C

Published online by Cambridge University Press:  12 December 2016

Yan Zeng ,
Pengpeng Zuo ,
Xiaochun Wu  and
Shuwen Xia
Yan Zeng*
Affiliation:
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Advanced Ferrous Metallurgy, Shanghai University, Shanghai 200072, China; and School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Pengpeng Zuo
Affiliation:
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Advanced Ferrous Metallurgy, Shanghai University, Shanghai 200072, China; and School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Xiaochun Wu
Affiliation:
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Advanced Ferrous Metallurgy, Shanghai University, Shanghai 200072, China; and School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Shuwen Xia
Affiliation:
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Advanced Ferrous Metallurgy, Shanghai University, Shanghai 200072, China; and School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this paper many studies have been carried out to ascertain the phenomenon of strain-induced precipitation and coarsening of carbides in AISI H13 hot-work die steel during the tests at 700 °C. The microstructure of H13 with various loadings was studied to identify the effects of mechanical strain on the evolutionary behavior of carbides. SEM and TEM were used to observe the size and distribution of the carbides of each sample. It was found that the coagulation of carbides is more obvious in mechanical strained samples than that in mechanical strain-free sample which means mechanical strain promotes the precipitation and coarsening of carbides, and these processes are affected by the mechanical strain amplitude. Precipitation is increased by the strain enhanced because of more nucleation sites produced and accelerate the diffusion of solute atoms. Moreover, the results are shown that lower strain rates are more beneficial for precipitation and coarsening of carbides under the same strain because they provide a longer time to nucleate and grow into nuclei.

Keywords

carbonizationhardnessmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3841 - 3849
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Copyright
Copyright © Materials Research Society 2016 

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