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Advancements in Joining Armor Grade Steels

Evans, William Charles
http://rave.ohiolink.edu/etdc/view?acc_num=osu1556816907125644

Abstract Details

2019, Master of Science, Ohio State University, Welding Engineering.
The defense industry employs several advanced armored combat vehicles, in a wide array of different environments, and applications. Today’s vehicles have been in service for up to 3 decades and are expected to fill much different roles than when initially designed. This means newer systems and armor material have been added to the vehicles, adding several tons of weight from these additions. The defense industry is actively trying to increase the transportability and the performance of their vehicles through light-weighting. When light weighting a vehicle, it is imperative to examine the materials and manufacturing processes used to create it. This body of research focuses on joining advanced armor steels, and processes to increase the performance of said armor steel. The materials investigated are conventional widely utilized RHA steel and a light-weight armor grade material based on the Fe-Mn-Al ternary system. To increase the material performance of armor steel joints and to reduce material usage the feasibility of joining RHA using FSW techniques is examined and the mechanical performance of these joints are tested. The cross weld UTS shows good results with values over 170 ksi observed, but material elongation was extremely low topping out around 5%. The SZ hardness values are similar to that of as quenched base material, which leads to a very brittle weld SZ. This brittle SZ exhibits low CVN energy values with an increase in absorbed energy in the HAZ/BM. The general weldability of the FeMnAl alloy family is investigated using conventional arc welding methods and the cast pin tear test to examine this alloy’s susceptibility to hot cracking issues. The cast FeMnAl used for CPTT showed evidence of liquation cracking in the weld HAZ and solidification cracking susceptibility from the CPTT.
Antonio Ramirez, PhD (Advisor)
Carolin Fink, PhD (Committee Member)
115 p.
Engineering; Materials Science; Metallurgy
Friction Stir Welding; FSW; Friction Stir Welding of Steel; FeMnAl; Cast pin tear test; Hot Cracking; Armor Steel

Recommended Citations

Citations

  • Evans, W. C. (2019). Advancements in Joining Armor Grade Steels [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556816907125644

    APA Style (7th edition)

  • Evans, William. Advancements in Joining Armor Grade Steels. 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1556816907125644.

    MLA Style (8th edition)

  • Evans, William. "Advancements in Joining Armor Grade Steels." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556816907125644

    Chicago Manual of Style (17th edition)

osu1556816907125644
682
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This open access ETD is published by The Ohio State University and OhioLINK.