摘要
通过光学显微镜、透射电镜(TEM)和显微硬度计观测,对成品套圈宏观硬度过低的原因进行分析,结果表明:由于套圈浸入油冷却介质时的淬火温度T_o过低(A_(c1)以下),使过冷奥氏体发生A→P(F+F_(e3)C)转变形成珠光体类型的团块状屈氏体(极细珠光体)。测量结果说明,过冷度的大小对屈氏体组织的相对含量和宏观硬度有明显影响,随着过冷度的增大屈氏体体积百分数V_v降低,宏观硬度提高;反之亦然。附图4幅,表2个,参考文献5篇。
On the basis of observation of optical microscope, T EM and microhardness durometer , the cause of excessive low macro hardness of bearing ring is analyzed. The result shows: due to the quenching temperature TQ of rings which are being immersed in Oil (as a cold medium) is too low (under A the conversion of A into PCF+Fe3C is occured , and the nodular and massive I roostite (extreme fine pear lite ) is formed from supercooled austenite. The measuring result shows: the magnitude of degree of supercooling has obvious influence on macro hardness and relative content of troostite organization . Along with the increase of degree of supercooling, the volume percenta ge Vv of troostite will decrease but the macro hardness will increase conversely and contrariwise.
出处
《轴承》
北大核心
1990年第6期28-31,57,共4页
Bearing
