论文部分内容阅读
研究了Ｗ，Ｃｏ，Ｎｉ对时效合金强度和韧性的影响。结果表明：高Ｃｏ的ＦｅＷＣｏ合金有强的时效硬化能力，但其韧性较低。以Ｎｉ取代部分Ｃｏ之后，合金的韧性得到大的提高。ＦｅＷＣｏ合金的Ｃｏ量约２３％，Ｗ，Ｍｏ总量超过１８％时，硬度增加甚少，韧性损害较大，而ＦｅＷＣｏＮｉ的Ｃｏ当量达２３％，Ｗ，Ｍｏ总量达２４％时获得最佳的强度和韧性的配合。萃取化合物的Ｘ射线衍射（ＸＲＤ）分析表明，时效合金的主要金属间化合物是Ｆｅ３Ｗ２型，还有Ｆｅ７Ｗ６和Ｆｅ２Ｗ型化合物。淬火态、退火态萃取物的化学分析表明，时效合金中，Ｗ，Ｍｏ主要存在于化合物中，而Ｃｏ，Ｎｉ主要存在于固溶体中。时效硬化主要通过Ｗ，Ｍｏ金属间化合物的析出引起。而Ｃｏ，Ｎｉ主要通过影响析出相的数量、析出物形态及分布状态来影响时效硬化。
The effects of W, Co and Ni on the strength and toughness of aged alloys were studied. The results show that: high Co Fe W Co alloy has a strong age hardening, but its toughness is low. With Ni replacing some of the Co, the toughness of the alloy is greatly increased. Fe W Co Co content of about 23%, W, Mo total amount of more than 18%, little increase in hardness, greater damage to toughness, and Fe CoW Co equivalent of 23%, W, The best combination of strength and toughness is achieved when the Mo content reaches 24%. X-ray diffraction (XRD) analysis of the extracted compounds showed that the main intermetallic compound of the aged alloy is Fe3W2 type, and Fe7W6 and Fe2W type compounds. The chemical analysis of quenched and annealed extracts showed that W and Mo are mainly present in the compounds, while Co and Ni are mainly present in the solid solution. Age-hardening is mainly caused by the precipitation of W and Mo intermetallic compounds. However, Co and Ni mainly affect the age hardening by influencing the number of precipitated phases and the morphology and distribution of precipitates.