Application of a Low Heat Input Deposition Process for Refurbishment of Worn PM Forming Dies Using Fe-Ni Based Filler Metal

Q4 Materials Science Powder Metallurgy Progress Pub Date : 2018-11-01 DOI:10.1515/pmp-2018-0013

M. Ebrahimnia, Hamzeh Baghjari, M. Ajdari, Alireza Hajesmaeli, M. Hojati

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引用次数: 1

Abstract

Abstract Refurbishment of worn Dies is an interesting research area which also has high economic benefit. Material which is used in PM dies for compacting powders are high carbon steel which have very low weldabilitis. Due to the high hardness, high carbon content and martensitic microstructure, these Dies are very sensitive to the thermal shock produced from fusion welding. For successfully refurbishing the worn Dies, Fine spark deposition was used for deposition of a new layer on the cold work 1.2436 steel. Different heat inputs were used for deposition of nickel based material and finally microstructure and HAZ were studied. Results show the HAZ area is very narrow, free from cracks and HAZ microstructure is similar to the base metal. GTAW welding using same filler metal induced many cracks in HAZ of weld which is detrimental to the refurbished Die performance. Results show increasing heat input in Fine spark deposition can results in crack formation in HAZ even if the weld pool does not occurred in base metal. However these cracks are much smaller than those occurred in GTAW.

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低热输入沉积工艺在铁基填充金属修复磨损PM成形模具中的应用

摘要废旧模具的翻新是一个有趣的研究领域，具有较高的经济效益。用于粉末压制的PM模具中的材料是具有非常低的可焊接性的高碳钢。由于高硬度、高碳含量和马氏体微观结构，这些模具对熔焊产生的热冲击非常敏感。为了成功地翻新磨损的模具，精细火花沉积被用于在冷加工1.2436钢上沉积新的层。采用不同的热输入对镍基材料的沉积进行了研究。结果表明，热影响区非常狭窄，没有裂纹，热影响区域的微观结构与母材相似。使用相同填充金属的GTAW焊接会在焊接HAZ中产生许多裂纹，这不利于翻新模具的性能。结果表明，即使母材中没有出现熔池，细火花沉积中增加的热输入也会导致HAZ中的裂纹形成。然而，这些裂纹比GTAW中出现的裂纹小得多。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Powder Metallurgy Progress Materials Science-Metals and Alloys

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1.00

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