In situ heat treatment in selective laser melted martensitic AISI 420 stainless steels
By Pavel Krakhmalev, I. Yadroitsava, Gunnel Fredriksson, I. Yadroitsev. 2015
217 citations recorded by the source corpus.
Abstract The article explores an evolution of a microstructure in AISI 420 martensitic stainless steel during selective laser melting. Several upper layers had hardness of 750 HV and contained 21 ± 12 vol.% austenite phase. The final bulk microstructure consisted of thermally decomposed martensite with hardness of 500–550 HV and unusually high, 57 ± 8 vol.%, amount of austenite. Obtained results indicate that during manufacturing a partitioning and austenite reversion took place, owing to the thermal cycling of the inner regions during manufacturing. Numerical simulation was found plausible to analyze and explain thermally activated processes that occurred in situ. Results of numerical simulation of the thermal cycles in dependence on the processing parameters suggested a possibility to control the thermal processes by variation of the laser energy input.
Subfields: Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/6719fc71e0bb5b87d4c5d065927360c5591b2620
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Mechanical Engineering
- I. Yadroitsava
- I. Yadroitsev
- Pavel Krakhmalev
- D. Herzog
- E. Wycisk
- V. Seyda
- C. Emmelmann
- A. du Plessis
Citations in the corpus
- Additive manufacturing of metals (2016, background): “This behaviour has been reported for precipitation hardening steel (174 PH [50,75,76]) and maraging steel (18-Ni300 [71,72]), but also for the martensitic stainless steel grade AISI420 (X46Cr13) [78].”
- Massive nanoprecipitation in an Fe-19Ni-xAl maraging steel triggered by the intrinsic heat treatment during laser metal deposition (2017, unknown): “The effectiveness of the IHT on phase transformations has been shown in previous studies on different alloys such as Ti-6Al-4V [32e34], austenitic stainless steels [35], martensitic stainless steels [36] and maraging steels [31].”
- Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion (2018, background): “Recently, it was shown in [28] that in the LPBF of a martensitic stainless steel subjected to martensitic transformation upon cooling, fresh martensite needles grow freely through the cell boundaries, but stop at the colony boundary.”