激光粉末床熔合制备P21工具钢的组织与力学性能

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-06-13 DOI:10.1016/j.matlet.2025.138930

A. Rajesh Kannan , V. Rajkumar , S. Maheshwaran , N. Siva Shanmugam , Wonjoo Lee , Jonghun Yoon

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引用次数: 0

摘要

研究了激光粉末床熔合制备P21工具钢的显微组织演变和力学性能。由于快速凝固，在顶部附近形成细小的马氏体基体，残余的奥氏体很少，在形成中期转变为柱状奥氏体晶粒，并有排列的马氏体板条。在底部，显微组织变粗，显示板条变厚以及热积累和循环再加热造成的回火迹象。这些变化显著影响机械性能。P21试样的平均极限抗拉强度分别为902±20 MPa和843±5 MPa，水平和垂直拉伸率分别为23.50±1.00 %和24.70±1.30%。结果突出了lpbf加工的P21钢的关键结构-性能关系，并为优化模具应用中的性能提供了见解。

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Microstructure and mechanical properties of P21 tool steel fabricated via laser powder bed fusion

This study examines the microstructural evolution and mechanical properties of P21 tool steel fabricated via laser powder bed fusion (LPBF). A fine martensitic matrix with minimal retained austenite forms near the top due to rapid solidification, transitioning to columnar prior austenite grains with aligned martensitic laths mid-build. Toward the bottom, microstructures coarsen, showing lath thickening and signs of tempering from thermal accumulation and cyclic reheating. These variations significantly impact mechanical behavior. P21 specimens exhibited average ultimate tensile strengths of 902 ± 20 MPa and 843 ± 5 MPa, with elongations of 23.50 ± 1.00 % and 24.70 ± 1.30 %, in the horizontal and vertical orientations, respectively. The results highlight critical structure-property relationships in LPBF-processed P21 steel and offer insights for optimizing performance in tooling applications.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive