EFFECT OF POST-HEAT TREATMENT ON THE IMPACT TOUGHNESS AND CRACK PROPAGATION MECHANISM OF AISI D2 TOOL STEEL MANUFACTURED BY DIRECT ENERGY DEPOSITION

被引：2

作者：

Park, Jung-Hyun ^{[1
]}

Kim, Kyu-Sik ^{[1
]}

Yong-Mo-Koo ^{[2
]}

Kim, Jin-Young ^{[3
]}

Kim, Min-Chul ^{[4
]}

Lee, Kee-Ahn ^{[1
]}

机构：

[1] Inha Univ, Dept Mat Sci & Engn, Incheon 22212, South Korea

[2] Changsung Corp, Incheon 21628, South Korea

[3] Maxrotech Corp, Daegu 42703, South Korea

[4] Korea Atom Energy Res Inst KAERI, Daejeon 34057, South Korea

来源：

ARCHIVES OF METALLURGY AND MATERIALS | 2023年 / 68卷 / 01期

关键词：

AISI D2 tool steel; Direct Energy deposition; Post-heat treatment; Impact toughness; Fractograpy;

D O I：

10.24425/amm.2023.141483

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This study investigated the effect of heat treatment on the microstructure and impact toughness property of AISI D2 manu-factured with direct energy deposition (DED) and compared the results with conventional wrought material. The fracture crack propagation behavior was examined in connection with microstructures through fracture surface analysis. AISI D2 manufactured with DED had a eutectic structure that turned into a net-type carbide after heat treatment, and Cr-rich needle-type secondary carbide was observed. Impact toughness of DED AISI D2 measured 2.0 J/cm2 in the as-built sample and 1.1 J/cm2 in the heat-treated sam-ple. Compared to a wrought heat-treated AISI D2, DED AISI D2 had relatively low impact toughness. DED AISI D2 and wrought material had different crack propagation mechanisms. In DED AISI D2, the eutectic structure and net-type carbide boundary were identified as the major microstructural factor decreasing impact toughness.

引用

页码：119 / 122

页数：4

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