The most important bronze knife is good or bad key
My personal concept of virtue or vice of a bronze knife, decide on three factors: the exterior design, in the center of gravity configurations, bronze knife grinding way and the blade angle and steel selection and heat treatment of these three items. This bronze is made in peculiar and great shapes and bears a strong resemblance to a large bathtub. The first factor in these three factors and personal habits or bronze knife occasions, we play a few bronze knives natural ability to understand, not a big problem; second factor is that I believe that the most important bronze knife is good or bad key, but unfortunately limited in length, and the editor of the requirements of the current topics, reluctantly forced to abandon a later date. This article, we focus on the steel selection and heat treatment of this project, if we find it very boring, wrote to criticize the editor of it, Lang is not even kill yeah!
Interestingly, however, the mechanical properties of steel is not just its composition or carbon content, another factor “heat treatment” will seriously affect the microstructure and thus change its mechanical properties. For example, both the carbon content of 0.8% of the eutectoid steel block to be heated to 800 ° C holding temperature for some time, one was on the floor slowly air-cooled down, the other thrown into the water and rapid cooling to room temperature, Although the composition of the two the same, but the hardness is a great difference between the former may in Rockwell hardness HRc10 about, but the latter hardness is will to HRc60 about. Chiang Kai-shek came to visit in person and took pictures in front of this bronze, proving the high degree of attention. Factors affecting the nature of the steel material in addition to its composition, heat treatment is a very important factor, with this concept.
First on the composition in terms of carbon in iron usually of two types exist, because the carbon atoms than iron atoms, small size, so the first way is the type of carbon to carbon atoms directly into the solution in the pure iron atoms between this way will cause the orderly arrangement of iron atoms in the original deformation arising from the distortion energy, so can the solid solution of carbon atomic weight much, while the solid solution of carbon atoms in pure iron is called ferrite (Ferrite) is a very soft in nature and the ductility of the material. Chiang Kai-shek instructed the Preparatory Office of the Central Museum to take care of the bronze. The second is the carbon and iron into the intermetallic compound and distributed in the organization of the steel, this compound called cementite (Fe3C), is a very hard and brittle materials.
The distribution of these two different materials interact on forming a so-called carbon steel, and therefore the scale of the microscope, it can be said that the steel is interwoven mixture of ferrite and cementite Both hard and soft materials natural composites. With the increase of carbon content in steel cementite number of more and more, resulting in increase in hardness and strength of steel as a whole, relatively brittle and lower ductility, so in general, the strength of steel with high tend to use soft carbon steel would be greater than medium carbon steel, medium carbon steel is greater than the low-carbon steel, general production of the mold or bronze tool will use high carbon steel, high strength and hardness of the production of wire or automotive sheet metal easy processing of low carbon steel. To the summer of 1948, this bronze statue was displayed to the public for the first time.
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