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将X70大变形管线钢管冷弯加工后进行不同温度时效处理,利用拉伸试验机和金相显微镜对其拉伸性能及显微组织开展研究.结果表明:230℃和250℃时效后,应力应变曲线出现屈服平台;时效后显微组织仍为铁素体+贝氏体(F+B),随时效温度上升,析出碳化物增多,材料屈强比增大,最高为0.93,应力比Rt1.5/Rt0.5减小,最低为1.01,均匀变形伸长率减小,最低为6.52%;受拉伸应变部位与受压缩应变部位相比,性能改变更明显,说明应变状态是影响应变时效后性能的主要因素;应变时效降低冷弯管塑性变形能力,综合涂覆效率及安全服役因素,防腐涂覆温度应在200℃左右为宜.

参考文献

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