Combination of cold drawing and cryogenic turning for modifying surface morphology of metastable austenitic AISI 347 steel

Hotz, Hendrik; Kirsch, Benjamin; Becker, Simone; Müller, Ralf; Aurich, Jan C.

doi:10.1007/s42243-019-00306-x

Cited by 11 publications

(3 citation statements)

References 51 publications

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“…The Fig. 2 e Process chains for the manufacture of components with hardened surface layer from metastable austenitic steels: a) conventional process chain, b) surface layer hardening during cryogenic turning, according to [48].…”

Section: Measurement Technologymentioning

confidence: 99%

Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

Hotz

Kirsch

Zhu

et al. 2020

Journal of Materials Research and Technology

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In this paper, the effect of shot peening and cryogenic turning on the surface morphology of the metastable austenitic stainless steel AISI 347 was investigated. In the shot peening process, the coverage and the Almen intensity, which is related to the kinetic energy of the beads, were varied. During cryogenic turning, the feed rate and the cutting edge radius were varied. The manufactured workpieces were characterized by X-ray diffraction regarding the phase fractions, the residual stresses and the full width at half maximum.The microhardness in the hardened surface layer was measured to compare the hardening effect of the processes. Furthermore, the surface topography was also characterized. The novelty of the research is the direct comparison of the two methods with identical workpieces (same batch) and identical analytics. It was found that shot peening generally leads to a more pronounced surface layer hardening, while cryogenic turning allows the hardening to be realized in a shorter process chain and also leads to a better surface topography. For both hardening processes it was demonstrated how the surface morphology can be modified by adjusting the process parameter.

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Section: Measurement Technologymentioning

confidence: 99%

Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

Hotz

Kirsch

Zhu

et al. 2020

Journal of Materials Research and Technology

Self Cite

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“…Austenitic stainless steels including AISI 304 grade have been the materials of choice for fabricating components and tools which require a combination of high strength and excellent corrosion resistance in service environments (Ma et al, 2016). AISI 304 has found extensive applications in the fabrication of food and beverage equipment in the food processing industry (Hotz et al, 2019), automotive exhaust system in automotive industry (Hong and Shin, 2017) and nuclear reactor and heat exchangers in the power generation industry (Arivazhagan et al, 2011). The fabrication of these components usually requires joining of various parts.…”

Section: Introductionmentioning

confidence: 99%

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

Abioye

Omotehinse

Oladele

et al. 2020

WJE

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Purpose The purpose of this study is to determine the effects of post-annealing and post-tempering processes on the microstructure, mechanical properties and corrosion resistance of the AISI 304 stainless steel gas metal arc weldment. Design/methodology/approach Gas metal arc welding of AISI 304 stainless steel was carried out at an optimized processing condition. Thereafter, post-annealing and post-tempering processes were performed on the weldment. The microstructure, mechanical and electrochemical corrosion properties of the post-weld heat treated samples, as compared with the as-welded, were investigated. Findings The as-welded joint was characterized with sub-granular grain structure, martensite formation and Cr-rich carbides precipitates. This made it harder than the post-annealed and post-tempered joints. Because of slower cooling in the furnace, the post-annealed joint contained Cr-rich carbides precipitates. However, the microstructure of the post-tempered joint is more refined and significantly devoid of the carbide precipitates. Post-tempering process improved the elongation (∼23%), tensile (∼10%) and impact (∼31%) strengths of the gas metal arc AISI 304 stainless steel weldment, while post-annealing process improved the elongation (∼20%) and impact strength (∼72%). Owing to the refined grain structure and significant elimination of the Cr-rich carbide precipitates at the joint, the post-tempered joint exhibited better corrosion resistance in 3.5 Wt.% NaCl solution than the post-annealed and the as-welded joints. Originality/value The appropriate post-weld heat treatment that enhances microstructural homogeneity and quality of the AISI 304 gas metal arc welded joint was determined.

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“…The factors that affect the metastable austenite phase transformation are the chemical composition, microstructure, temperature, stress/strain characteristics, and their combination [4]. The martensite transformation criteria rely on the stacking fault energy (SFE) of austenite and the phase transformation temperature of martensite Ms [5].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Drawing Deformation Rate Induced Inhomogeneous Local Distortion on Phase Transformation of 304H Stainless Wire

Xu¹,

Peng

Zhu³

et al. 2020

Metals

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The micro/macro magnetic properties, local element distribution, martensite transformation, and mechanical properties of 304H stainless wires are determined for two cold drawing chains. Finite element simulations are used to analyse the local strain and heat generation. The results show that there is obvious inhomogeneity in the magnetic properties, strain/stress relationship, and strain-induced heat within the drawn wires. Comparing wires with the same total strain, a larger area reduction of previous drawing processes contributes to a higher volume of the martensite phase, while a smaller area reduction of the first process results in an inhibited phase transformation. A higher single strain in the first drawing process leads to additional heat generation at the subsurface of the wire, which would eventually retard the martensite transformation. The inhomogeneous deformation-induced differences in the grain size affect the stability of austenite and transform the final martensite.

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Combination of cold drawing and cryogenic turning for modifying surface morphology of metastable austenitic AISI 347 steel

Cited by 11 publications

References 51 publications

Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

The Effect of Drawing Deformation Rate Induced Inhomogeneous Local Distortion on Phase Transformation of 304H Stainless Wire

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