Yaki-ire, or clay tempering, is a style of steel hardening. It isolates the hardening to the places the bladesmith wants hard (such as the edge), while keeping the rest of the piece tough (the body and spine). If the style is perfected, it results in blades that combine the best qualities of steel: hardness and durability at the edge, and toughness as the foundation to prevent breaking from brittleness in the blade. The transition zone between the two qualities of steel is called hamon. I’m curious to see if a hamon, a sort of frosty, wavy line that delineates the transition, is visible on the blades I treated using yaki-ire.
Preparing the Clay
I took the sister blades I featured in my last post and applied a clay mask to each of them using the recipe I found on the Crossed Heart Forge website (a wealth of information, by the way). The basic recipe is:
1 part clay (binds the mix)
1 part crushed sand/grog (prevents cracking and shrinkage)
1 part crushed charcoal (prevents flaking off in the fire due to heat expansion)
The goal is to crush these materials as fine as possible, for the smallest size grain determines the minimum thickness of the clay slip or mask that can be applied. This post covers how I prepared the clay mixture.
Bringing it all together
Now that I had my three (four technically) constituent parts, I was ready to mix them in equal proportion (by volume) and add water. The consistency to aim for the mask that goes on the body of the blade is pancake batter. It seemed to me to be like the texture of mortar when laying down tiles.
My next post will feature a video where I mix and apply the clay mask to the hori hori. Stay tuned!
Working on some new tool designs, I took an old lawn mower blade and recycled it to use as stock for a kusakezuri (Japanese hand hoe) and a hori hori. In my continuing study of Japanese agricultural tools made with reclaimed steel, I’ve created these as prototypes. The fact that the two blades are sisters really speaks to me, and I plan to let whoever becomes the owner of these tools know it.
Heat Treatment Process
The hand hoe is ready for heat treatment. The process involves annealing (which I did already), then normalizing the blade for two or three cycles depending on if the blade warps as it cools. Finally, the blade will be hardened by quenching. For this particular steel from the reclaimed lawn mower blade, I took a piece of it and tested it. It hardened very well at a cherry red heat quenched in room temperature water. For longer pieces like a blade, however, quenching it in a medium like that could cause it to warp excessively or even crack from the stress of cooling so quickly.
I next tried hardening the test piece in warm vegetable oil (came out soft), and then cold vegetable oil. The second result had ok hardness (a file barely scratched it). I decided to quench the hori hori blade in the cold vegetable oil. This is the result:
The blade warped slightly, curving upwards, and the edges were a little soft for my liking, with the file biting a bit. The ideal is a file skating on the surface of the hardened steel. I’m going to harden the hori hori again, but this time using yaki-ire to harden the edges. I will use the same process for the hand hoe as well.
Yaki-ire is a style of edge hardening that is accomplished by applying a clay mask to all surfaces of the blade except for the edge. When the 1-2 mm clay layer is dry, the blade is heated to the correct temperature and then quenched in water. Water quenches faster than oil, so I believe this will give the hardness that I want while maintaining some toughness in the rest of the blade.
The back side of a single bevel blade is called ura in Japanese, and in the picture above I forged a slight concave on the ura to make sharpening easier. This is a traditional method for forging single bevel blades. The blade will fit into a slot cut into a hardwood handle. An iron ferrule is used to support the tang and blade; for the support to work correctly the ferrule must fit snugly with both the tang and the wood. It takes a bit of work to ensure all the pieces fit properly.