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粉末冶金耐热合金凝固工艺的优点和局限性在生产中继续不断地变化,以便制造商能够不断地满足用户的需要。过去几年的缺点正被克服,例如,通过严格的处理和质量控制措施,净化粉末的产品几乎消除了非金属杂质,这是粉末冶金耐热合金粉末和凝固中的一个主要问题。其它的问题正在引起更大的注意,例如,多相颗粒,凝固前颗粒边界上的碳化物,热等压压制耐热合金凝固时可预测的零件收缩。由于热等压压制动态成型的优点和致密,改进热等压压制工艺,可以消除与多颗粒变形的有关问题及在复杂的零件凝固时提高尺寸的控制能力。以下是目前粉末冶金耐热合金凝固工艺的主要优点和缺点。
The advantages and limitations of the powder metallurgy heat-resistant alloy solidification process continue to change during production so that the manufacturer can continually meet the needs of the user. The shortcomings of the past few years are being overcome. For example, the products that purify the powder almost eliminate the non-metallic impurities by strict handling and quality control measures, which is a major problem in powder metallurgy heat-resistant alloy powder and solidification. Other issues are drawing more attention, for example, multi-phase particles, carbides on the grain boundaries prior to solidification, and predictable shrinkage of parts upon solidification of a hot isopressed heat-resistant alloy. Due to the advantages of hot isostatic pressing and the advantages of compacting and improving the hot isostatic pressing process, the problems associated with multi-grain deformation can be eliminated and the size control ability can be improved when the complicated parts are solidified. The following are the main advantages and disadvantages of the current solidification process of powder metallurgy heat-resistant alloys.