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本文在研制了双试棒热裂－线收缩仪的基础上．对铝－铜系合金、钢、镍基合金等的热裂规律进行了测试和考证，明确了自由线收缩与产生热裂时受阻线收缩之间的关系，提出了以合金自由线收缩变化率ｄｌ／ｄｔ的极大值来分析研究对合金热裂倾向影响的观点，从而对合金热裂产生的温度范围，产生热裂的主要因素以及合金热裂形成的机理进行了探讨。
In this paper, the development of a double test-rod thermal crack - line shrinkage on the basis of. The thermal cracking rules of aluminum-copper alloy, steel and nickel-based alloy were tested and verified. The relationship between free-line shrinkage and shrinkage shrinkage during hot cracking was clarified. dl / dt maximum value to analyze the impact of hot cracking tendency of the alloy point of view, thus the temperature range generated by the thermal cracking of the alloy, the main factors resulting in thermal cracking and hot cracking mechanism was discussed.