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采用可变拘束试验、热塑性试验、差热分析、光镜与扫描电镜观察，研究了GH150合金焊接热影响区液化及液化裂纹形成机制加热过程中温度高于1250℃的热影响区由于γ／（Nb，Ti）C共晶产生液化，在温度达到1353℃（固相约至1375℃（液相线）的近维区，晶内出现大量液化点冷却过程中温度在1273和1200℃时形成γ／（Nb，Ti）C共晶和γ／Laves相共晶．（Nb，Ti）C组分液化及形成γ／Laves相共晶是GH150合金液化裂纹形成的主要冶金因素．
The heat affected zone (LNZ) of liquefaction and liquefaction crack in the heat-affected zone (LHZ) of GH150 alloy was investigated by means of a variable restraint test, a thermomechanical test, a differential thermal analysis, a light microscope and a scanning electron microscope. Nb, Ti) C eutectic is formed. At a temperature of 1353 ℃ (liquid phase near the solidus phase), a large number of liquefaction points appear in the near-dimensional region in the solidification phase. When the temperature is 1273 ℃ and 1200 ℃, (Nb, Ti) C eutectic and γ / Laves phase eutectics.The (Nb, Ti) C component liquefaction and the formation of γ / Laves phase eutectics are the main metallurgical factors for the formation of liquefaction cracks in GH150 alloy.