本文研究了Cr-Mn-N不锈钢的对称拉压低周疲劳行为。结果表明,在相同的总应变幅下,1050℃固溶处理比1250℃固溶处理的试样的疲劳寿命几乎高一倍。在所使用的应变幅(±0.4—±1.2％)范围内,循环到饱和后都观察到软化现象,而在低应变幅下较早到达饱和阶段。每周的平均能量损耗随应变幅的增加而增加,而试样全寿命的总能量损耗则随应变幅的增加而降低。疲劳试样断口的扫描电子显微镜观察表明,低温固溶处理的试样断口为穿晶和沿晶的混合型断裂,以穿晶为主,并有清晰的疲劳条纹。高温固溶处理的试样断口则以沿晶断裂为主。
An investigation was conducted to examine the symmetric lowcycle push-pull fatigue behaviour of the Cr-Mn-N dual-phase stainless steel whichwas separated into two specimen groups A and B by solution treated at 1050 and1250℃ respectively. The fatigue life of A is almost twice as long as B under sametotal amplitude of strain. Within the tested amplitude range of strain, ±0.4-±1.2%, the cyclic softening is observed both of them after the cycle saturated, whilethe saturation stage is earlier reached under lower amplitude of strain. The aver-age energy loss of each cycle increases and the sum of energy loss of total life ofeach specimen decreases with the increase of strain amplitude. Observation on thefatigue fracture surface under SEM shows that the specimen A is mixed type and thetransgranular mode predominantly with clear fatigue striation, and the specimen Bis mainly the intergranular mode.
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