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Application of a low heat input deposition process for refurbishment of worn PM forming Dies using Fe-Ni based filler metal

Publish Year: 1397
Type: Conference paper
Language: English
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Document National Code:

PMAUTO06_133

Index date: 14 December 2018

Application of a low heat input deposition process for refurbishment of worn PM forming Dies using Fe-Ni based filler metal 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.

Application of a low heat input deposition process for refurbishment of worn PM forming Dies using Fe-Ni based filler metal Keywords:

Application of a low heat input deposition process for refurbishment of worn PM forming Dies using Fe-Ni based filler metal authors

Mohamad Ebrahimnia

Assistance professor, Material engineering department, Tehran Science and research branch, Islamic Azad University, Tehran, Iran

Hamzeh baghjari

PhD, Material Engineering, Tarbiat Modares University, Tehran, Iran

Alireza Hajesmaeli

Mashhad Powder metallurgy Company, R&D and Engineering department, Mashad, Iran.

Milad Hojati

Mashhad Powder metallurgy Company, R&D and Engineering department, Mashad, Iran.