本文選題：高速鋼　切入點：噴射成形　出處：《工程科學(xué)學(xué)報》2015年03期

【摘要】：采用噴射成形技術(shù)制備了M3型高速鋼和以Nb替代V的M3型高速鋼.利用掃描電鏡、X射線衍射、差示掃描量熱儀和金相顯微鏡研究了Nb對M3型高速鋼組織的影響.噴射成形能有效消除宏觀偏析,細化組織.以Nb代V,提高了MC型碳化物開始析出溫度,大量MC相先于共晶反應(yīng)析出,呈獨立的近球形分布于晶界,同時其尺寸減小.由于消耗大量C,抑制了共晶反應(yīng),M2C片層數(shù)量減少且厚度變薄,其在熱變形過程中更易于分解,進一步增加了組織均勻性.低溫低載荷時含鈮的M3型高速鋼抗磨損性能顯著優(yōu)于M3高速鋼,溫度升高到500℃時磨損機制逐漸以氧化磨損為主,兩合金的抗磨損性能差距減小,主要原因是大量呈彌散球形分布的含鈮MC型碳化物能有效提高高速鋼的磨粒磨損抗性,而其對抗氧化性能并無明顯作用.
[Abstract]:M3 type high speed steel and M3 type high speed steel substituted by NB for V were prepared by spray forming technology. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to prepare M3 type high speed steel. The effect of NB on the microstructure of M3 type high speed steel was studied by differential scanning calorimetry and metallographic microscope. Spray forming can effectively eliminate macro segregation and refine microstructure. A large number of MC phases precipitated prior to eutectic reactions, distributed at grain boundaries as independent near-spherical particles, and their size decreased. Due to the consumption of a large amount of C, the decrease in the number and thickness of M2C lamellar layers in eutectic reaction was inhibited, and it was easier to decompose in the process of thermal deformation. At low temperature and low load, the wear resistance of M3 type high speed steel containing niobium is obviously better than that of M3 high speed steel. When temperature rises to 500 鈩，

本文編號：1669159