Ｆｅ－３６％Ｎｉ合金（因瓦合金）在热加工时往往由于晶界氧化而产生破裂，因此研究了热加工变形速率和合金含Ｓ量对于热裂的影响。研究结果表明：（１）合金以低变形速率热加工时，在１１００℃以下容易产生热裂，随着Ｓ含量的增高热裂发生范围扩大，（２）热裂是沿着柱状晶 Fe-36% Ni alloy (Invar alloy) is often due to grain boundary oxidation during the thermal processing rupture, so hot deformation rate and alloy S content on thermal cracking. The results show that: (1) When the alloy is hot-worked at low deformation rate, hot cracking occurs easily below 1100 ℃, and the range of thermal cracking increases with increasing S content. (2)