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一、消除耐热合金淬火裂纹的方法 美国联合技术公司发明了一项Ni基耐热合金热处理新工艺,并获得了专利权(专利号为:4654091,于1987年3月31日公布)。 这一热处理新工艺可预防Ni基耐热合金零件(例如燃气涡轮盘)在淬火时产生裂纹 方法是在零件淬火前事先电镀一层薄的Ni或Ni合金镀层,镀层含60％以上的Ni,镀层的其它成分为Cr、Co和Fe。这种镀层可防止耐热合金加热时的晶间氧化和热处理时产生淬火裂纹。镀层的厚度应大于合金在退火中所形成的氧化层的最大厚度,一般大于0.4mm的镀层就足以防止淬火裂纹。
First, the elimination of heat-resistant alloy quenching crack United Technologies Corporation invented a Ni-based heat-resistant alloy heat treatment process, and obtained a patent (Patent No .: 4654091, published in March 31, 1987). This new heat treatment process prevents Ni-based heat-resistant alloy parts such as gas turbine discs from cracking during quenching by pre-plating a thin Ni or Ni alloy coating prior to quenching of the part, the coating containing more than 60% Ni, The other components of the coating are Cr, Co and Fe. This coating prevents the formation of quench cracks during intergranular oxidation and heat treatment when the heat-resistant alloy is heated. The thickness of the coating should be greater than the maximum thickness of the oxide layer formed during the annealing of the alloy. Generally, the coating larger than 0.4mm is enough to prevent the quenching crack.