【摘要】 研究了42CrMo钢离子氮化—沉淀强化的组织结构,结果表明,离子氮化层的组成为ε、r＇a_N、Fe₃C和少量Cr₂N、Mo₂N、CrMoN_x及a";经时效处理后,ε相和a_N相弥散析出Cr₂N、Mo₂N和a" 。325℃时效,CrMoN_x消失;500℃时效,Mo₂N大大减少。a"、Cr₂N和Mo₂N弥散共格析出,必将使氮化层强化。更多还原

【Abstract】 The Constitution of the 42CrMo steel is studied,the results of which show that the ion n ioing layer Consists of the e,r’ ,aN,Fe3c and a small amount of the Cr2N,Mo2N, CrMoNx and α." ,that after aging the ion nitriding layer,the Cr9N,Mo2N and a" will precipite from the α and aN phases,that if aging it at 325 ℃,the CrMoNx will disappear,that if aging it at 500 ℃, the Mo2N will decrease Considerably, and that the nitriding layer wiil be hardened when the , Cr2N and Mo2N precipitate coherently.更多还原