制备工艺对石油套管组织和强韧性的影响

发布时间：2018-01-15 16:25

  本文关键词：制备工艺对石油套管组织和强韧性的影响　出处：《材料热处理学报》2017年04期 　论文类型：期刊论文

  更多相关文章： 石油套管 双介质淬火 下贝氏体/马氏复相组织 强韧性

【摘要】：将25Mn V石油套管用钢通过直接淬水与水冷→空冷→水冷的双介质淬火冷却工艺分别处理成全马氏体组织与下贝氏体/马氏体复相组织,对比研究了不同淬火工艺下的微观组织特征及回火工艺参数对试验钢强韧性的影响。结果表明:双介质淬火所得下贝氏体/马氏体复相组织具有明显的强韧化效果,可以降低应力集中,有利于材料韧性的改善和阻止微裂纹的产生与扩展;力学性能测试表明,试验钢大约在400℃左右出现韧性低谷,呈现出低温回火脆性的特征,因此,该复相组织适合于在高温回火状态下使用,此时复相组织提高材料韧性的作用更为显著。
[Abstract]:Direct quenching and Water cooling of 25mn V Steel for Petroleum casing. 鈫扐ir cooling. 鈫扵he water-cooled double medium quenching cooling process is used to deal with the microstructure of complete martensite and lower bainite / martensite respectively. The effects of microstructure and tempering parameters on the strength and toughness of the steel under different quenching conditions were studied. The duplex microstructure of lower bainite / martensite obtained by double medium quenching has obvious strengthening and toughening effect. It can reduce the stress concentration, improve the toughness of materials and prevent the generation and propagation of microcracks. The mechanical properties of the steel show that the ductile valley occurs at about 400 鈩，

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