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On the microstructure and texture evolution in 17-4 ph stainless steel during laser powder bed fusion: Towards textural design

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Journal of Materials Science & Technology 2022年第22期117卷 183-195页

作者： M.S.Moyle N.Haghdadi X.Z.Liao S.P.Ringer S.Primig School of Materials Science&Engineering UNSW SydneyNSW 2052Australia Australian Centre for Microscopy&Microanalysis The University of SydneyNSW 2006Australia School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia

Additive Manufacturing (AM) of metals allows the production of parts with complex designs, offeringadvanced properties if the evolution of the texture can be controlled. 17-4 precipitation hardening (ph)stainless steel is a high strength, high corrosion resistance alloy used in a range of industries suitable forAM, such as aerospace and marine. Despite 17-4 ph being one of the most common steels for AM, thereare still gaps in the understanding of its AM processing–structure relationships. These include the natureof the matrix phase, as well as the development of texture through AM builds under different processingconditions. We have investigated how changing the laser power and scanning strategy affects the microstructure of 17-4 ph during laser powder bed fusion. It is revealed that the matrix phase is δ-ferritewith a limited austenite presence, mainly in regions of the microstructure immediately below melt *** fraction is independent of the printing pattern and laser power. However, reducing the timebetween adjacent laser passes during printing results in an increase in the austenite volume *** effect of the higher laser power, as well as additional remelting within the printing strategy, isan increase in the average grain size by epitaxial ferrite grain growth across multiple build layers andthe development of a mosaic type microstructure. Changes to the scanning strategy have significant impacts on the textures observed along the build direction, while (100) texture along the scanning directionis observed consistently. Mechanisms for texture formation and the mosaic structure are proposed thatpresents a pathway to the design of texture via AM process control.

关键词： Additive manufacturing 17-4 ph stainless steel Microstructure Texture

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Relationship of microstructure transformation and hardening behavior of type 17-4 ph stainless steel

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Journal of University of Science and Technology Beijing 2006年第3期13卷 235-239页

作者： Jun Wang Hong Zou Cong Li Ruling Zuo Shaoyu Qiu Baoluo Shen School of Materials Science and Engineering Sichuan University Chengdu 610064 China National Key Laboratory for Nuclear Fuel and Materials Nuclear Power Institute of China P.O. Box 436 Chengdu 610041 China School of Materials Science and Engineering Chongqing University Chongqing 400044 China

The relationship between the microstructure transformation of type 17-4 ph stainless steel and the aging hardening behavior was investigated. The results showed that, when 17-4 ph stainless steel aging at 595℃, the bulk hardness of samples attains its peak value （42.5 HRC） for about 20 min, and then decreases at all time. TEM revealed the microstructure corresponding with peak hardness is that the fine spheroid-shape copper with the fcc crystal structure and the fiber-shape secondary carbide M23C6 precipitated from the lath martensite matrix. Both precipitations of copper and M23C6 are the reasons for strengthening of the alloy at this temperature. With the extension of holding time at this temperature, the copper and secondary carbide grow and lose the coherent relationship with the matrix, so the bulk hardness of samples decreases.

关键词： 17-4 ph stainless steel H1100 condition precipitation copper secondary carbide

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