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Utilization of 8630 Steel in Golf Club Irons for Improved Performance

Authors
  • Hollingshaus, Gunnar
  • Reyes, Danielle
Publication Date
Jun 01, 2022
Source
[email protected]
Keywords
License
Unknown
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Abstract

TaylorMade Golf Company currently uses a two-piece construction of a forged 4140 steel face and investment cast 8620 steel body for P790 golf club irons. The cast body is welded to the forged face and then the assembly is austenitized, quenched, and tempered to form tempered martensite. It is proposed that a material substitution of 8630 steel for 8620 steel will lead to an increase in strength with a nominal tradeoff in ductility due to the 0.1 weight percent increase in carbon. To evaluate the yield strength, tensile strength, and ductility, tensile testing was conducted on cast 8620 and 8630 steel samples that were tempered at 400°C, 430°C, and 460°C. Optical microscopy and scanning electron microscopy were also used to investigate the microstructures and fracture surfaces of the tensile bars to identify any processing defects. Results indicated that 8630 steel quenched and tempered at 400°C had an average increase of 95.6 MPa in yield strength above the currently used 8620 steel quenched and tempered at 430°C; however, 8630 steel quenched and tempered at 400°C had an average percent elongation of 4.27, whereas 8620 steel quenched and tempered at 430°C showed an average percent elongation of 7.14. The increase in carbon content from 8620 steel to 8630 steel was determined to have a statistically significant increase in yield strength with a nominal tradeoff in ductility. In addition, the increase in carbon content also led to an increased tendency to observe brittle fracture in the steel tensile samples.

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