Ultrastrong and ductile synergy of additively manufactured H13 steel by tuning cellular structure and nano-carbides through tempering treatment

Wen, Tao; Yang, Feipeng; Yang, Hailin; Fu, Junwei; Ji, Shouxun

doi:10.1016/j.jmrt.2022.11.105

Cited by 22 publications

(1 citation statement)

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“…[ 20–22 ] However, it is not a universal phenomenon because there are also cases of high YS and low strain‐hardening rate in the as‐printed state. [ 23–25 ] At all indentation depths, AMH consistently exhibited higher hardness than CMH (Figure 2c). It is worth highlighting that both AMH and CMH displayed an increase in hardness as indentation depth decreased, which was more significant in AMH.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cell Structure on Yield Strength and Strain‐Hardening Behavior in Additively Manufactured H13 Hot Work Tool Steel

Kim,

Cho,

Kim

2024

steel research int.

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Mechanical properties including yield strength, hardness, and strain hardening are superior in additively manufactured H13 hot work tool steel (AMH) compared to conventional H13 (CMH), which are correlated with microstructural characteristics. Comprehensive microstructural analysis reveals that the strain is highly localized in the cell structure with retained austenite in AMH. Quenching and tempering (QT) heat treatment removes the cell structure and retains austenite from AMH, resulting in a microstructure and mechanical properties similar to CMH after QT. The constitutive equation for yield strength shows that retained austenite with sufficient amount of dislocation density in martensite contributes to higher yield strength in AMH than CMH and identical strengthening mechanism between AMH and CMH after QT. Furthermore, microstructural changes during plastic deformation are investigated to find the origin of high strain‐hardening rate in AMH. The relationship between hardness and indentation depth yields the higher statistically stored dislocation density in AMH than CMH. In addition to higher dislocation accumulation, transformation of retained austenite to α′ martensite results in transformation‐induced plasticity effect, which contributes to strain hardening.

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Section: Resultsmentioning

confidence: 99%