1. Inspection items Normally the test items after heat treatment of copper alloy castings are as follows:
1 Appearance size: According to the drawing requirements, use suitable measuring tools to check whether the casting size is within the tolerance range;
2 Hardness: check whether the hardness of the casting field with the furnace test J) 0 meets the requirements of the process specification;
3 Metallographic observation: Check the distribution of crystal grain size and precipitated phase, whether overheating, overheating or overaging has occurred, and judge according to relevant standards.
2. Heat Treatment Defects and Elimination Measures Cast copper and copper alloy castings also have some defects during heat treatment. Common defects and elimination measures are shown in Table 10-2.
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