Precipitation Behavior of σ Phase in ER316L Austenitic Stainless Steel and Its Wire Rod High-Speed Wire Rolling
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摘要: 通过固溶处理及高温压缩试验研究了固溶温度和应变速率对ER316L奥氏体不锈钢中σ相析出行为的影响，在此基础上制定了盘条高线轧制工艺的粗中轧参数并进行了盘条高线轧制，研究了盘条的组织及拉伸性能。结果表明：试验钢的显微组织由奥氏体相和σ相组成，σ相含量随固溶温度的降低或应变速率的增大而增加；为防止σ相的大量析出，在试验钢轧制过程中应保持较低的应变速率，且轧制温度应设置在1 000℃及以上。在此参数下轧制所得盘条中的σ相体积分数小于3%，抗拉强度均值为640.2 MPa，伸长率均值为48.7%，表现出较好的拉拔性能。Abstract: The effects of solid solution temperature and strain rate on the precipitation behavior of σ phase in ER316L austenitic stainless steel were investigated by solid solution treatment and high-temperature compression test. Based on the testing results, the rough and medium rolling parameters in high-speed wire rolling process of wire rod were designed and the high-speed wire rolling of wire rod was done. The microstructure and tensile properties of the wire rod were studied. The results show that the microstructure of the tested steel consisted of austenite phase and σ phase. The content of σ phase increased with decreasing solid solution temperature or increasing strain rate. In order to prevent the large precipitation of σ phase, the strain rate should keep slow and the rolling temperature should be set at 1 000℃ and above during the rolling of the tested steel. The volume fraction of σ phase in the wire rod rolled by the designed process was lower than 3%, the average tensile strength was 640.2 MPa and the average elongation was 48.7%; the wire rod illustrated a relatively good drawing performance.
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