Cutting member and manufacturing method thereof

A method of manufacturing a cutting member, wherein,

• the cutting member has a first portion for supporting, a second portion for forming a cutting edge, and a third portion connecting the first portion and the second portion;
• the manufacturing method comprises:
• providing a first metal material which is used for forming the first portion and has a first side;
• providing a second metal material which is used for forming the second portion and has a second side;
• wherein the first metal material is martensitic stainless steel having a carbon content of 0.1˜0.7%;
• and the second metal material is high-speed tool steel having a carbon content of not less than 0.7% or alloy tool steel having a carbon content of not less than 0.8%;
• welding the first side of the first metal material and the second side of the second metal material with high energy density beam to form the third portion at the welding site;
• and
• obtaining a cutting member blank after welding, and performing heat treatment on the cutting member blank, the heat treatment comprising:
• raising and holding the temperature of the cutting member blank in stages;
• quenching the cutting member blank after temperature raising;
• and
• tempering the cutting member several times after quenching.

A cutting member, wherein:

• the cutting member has a first portion for supporting, a second portion for forming a cutting edge, and a third portion connecting the first portion and the second portion;
• the first portion is comprised of a first metal material, and the first metal material is hardened stainless steel and has a first side;
• the second portion is comprised of a second metal material, the second metal material is tool steel and has a second side;
• and
• the third portion is formed by welding the first side of the first metal material and the second side of the second metal material with high energy density beam;
• after welding, the metallographic structure of the first portion near the third portion, the metallographic structure of the third portion, and the metallographic structure of the second portion near the third portion are substantially free of holes.