摘要
为了优化中碳贝氏体钢支承辊的磨削换辊工艺,研究了其接触疲劳时的裂纹萌生和扩展。在JPM-1B型接触疲劳试验机上测定了水润滑条件下的接触疲劳失效寿命曲线,并以裂纹沿平行表面方向扩展为判断标准,通过解剖试样的方法测定了裂纹萌生寿命曲线。结果显示两条曲线均在最大接触应力为0.86GPa处发生弯折,裂纹萌生寿命约为失效寿命的70%～80%。在扫描电镜下对试样观察发现:当接触应力较低时垂直裂纹占主导地位,而接触应力较高时棘齿裂纹占主导地位。这两种裂纹都具有一般短裂纹的特点。
Rolling contact fatigue crack initiation and propagation were investigated to optimize the grinding and replacing techniques of medium carbon bainitic backup roll. The failure life curve was measured using a rolling contact fatigue test machine JPM1B with water lubrication by the pit occurence and spalling on contact surface. The crack initiation life curve was measured by the turning porallel to crack surface on specimen section after different fatigue cycles. The results show that the two curves (the crack initiation life curve and the failure life curve) obviously deflect at a maximum contact pressure of 0.86 GPa and the initiation to failure life ratio is 70%~80%. The contact surface and the sections were observed using SEM. Perpendicular cracks dominates at lower stresses, while ratchetting cracks dominated at higher stresses. Both types of cracks have the same characteristics as general short cracks.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第12期1569-1571,1575,共4页
Journal of Tsinghua University(Science and Technology)
