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美国爱达荷(Idaho)国立技术研究所着眼于粉末冶金部件的显微组织所具有的特异性能,一直在研究粉末的三种结合成形法——爆炸结合法、热挤压法和均衡处理法。现在,304系不锈钢最受注目。粉末结合合金的特性取决于显微组织。粉末合金的特点是:无金属锭铸造法情况下易发生的晶粒长大现象,高温特性优异,抗拉强度、蠕变特性等机械性能显著得到改善。该研究所发现,304系粉末中含有多量的 He,其含量约达预料值的10000倍。该研究所认为,He 与显微组织内结晶中的空穴和易于逸出的原子有很强的亲和力,空穴可
The Idaho National Institute of Technology looks at the specific properties of the microstructure of powder metallurgy parts and has been studying three combinations of powder forming methods - explosive bonding, hot extrusion and equalization . Now, 304 series stainless steel the most attention. The properties of a powder-bound alloy depend on the microstructure. Powder alloy is characterized by: no metal ingot casting method prone to grain growth phenomenon, excellent high temperature properties, tensile strength, creep properties and other mechanical properties have been significantly improved. The Institute found that 304 contains a large amount of powder He, its content of about 10000 times the expected value. The Institute believes that He and the intramolecular organization of holes and easy to escape atoms have a strong affinity, holes can be