利用慢应变速率拉伸试验研究了应变速率对X80管线钢在土壤模拟溶液中的应力腐蚀的影响.采用的模拟溶液以我国西北部碱性土壤的化学成分为基础,在不同应变速率条件下进行试验.样品断裂后利用扫描电镜对断口形貌以及断口侧面二次裂纹进行观察.研究结果表明:X80钢在1.0×10-6s-1应变速率下表现出最高的应力腐蚀敏感性.低于该应变速率下,应力腐蚀敏感性略有降低；而高于该应变速率下,应力腐蚀敏感性明显减小.不同应变速率下应力腐蚀敏感性的差异主要是由应力腐蚀过程中腐蚀和力学作用的影响程度不同造成.应变速率低于1.0×10-6 s-1时,腐蚀作用影响更大,较长的腐蚀时间造成裂纹被腐蚀,裂纹扩展受到影响,因此应力腐蚀敏感性略有降低.当应变速率高于1.0×10-6s-1时,力学作用主导整个过程,形成的裂纹没有受到足够腐蚀的情况下,在力学作用下发生快速机械扩展、断裂,因此产生了明显降低的应力腐蚀行为.
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