There is a problem that we are particularly concerned about, that is, some cracks in some mold steel materials! The fracture of the cracks these problems, and those are caused by cracks in our material itself. Whether the fracture is a material problem or a heat treatment problem.

So I'm going to break it down into parts, and I'm going to start with the first part.

How do we tell the difference between a crack and a fracture? Everyone knows that. Some cracks will inevitably occur in the production of die steel materials.

How do we detect these cracks?!

Then the first is through the ultrasonic inspection, this is the most preliminary.

There is also the surface, the surface of our eyes to see, when we detect the leak, in the process of customer use found cracks or cracks, how to distinguish between heat treatment or the province produced.

42crmo sheet metal due to some weak parts of the metal around the utilization rate, local rupture will occur! Thus forming unstable defects, which directly destroy the continuity of the material. Because of the hard force applied in the force, most of the crack's tail end he is present at a very sharp Angle. Hard force Low hard force damage the inevitable existence of various fine cracks in the actual metal force, especially when we hit, many of the surface of the micro-grain is still broken. Why sometimes we have some materials to make a car to scrape to make skin, this habit is to the surface of some small cracks we wash him clean. So that when we heat treat it, it won't stretch, it won't crack. May be produced in the process of industry and use under certain debt and environmental conditions will gradually grow.

Once extended to a certain part size, the part size occurs the problem of full burst one by one. So when our materials come back, they must go through ultrasonic inspection. This is safer.

The fracture does not break the shell, the metal in the construction, the utilization rate is separated from the left and right to the abdomen, that is, the connection has been disconnected. I'm afraid it'll break in half or in half. This is called a fracture, and the natural surface exposed by the fracture is called a fracture.