纳米晶／微米晶316L不锈钢的原位拉伸力学行为研究  

In-situ observation of mechanical behavior of nano-/ microcrystalline 316L stainless steel in tension

作　　者：盛捷[1] 李俊琛[1,2] 喇培清[1,2] 魏福安 

机构地区：[1]兰州理工大学、材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学、省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]青海大学、机械工程学院,青海西宁810016

出　　处：《纳米科技》2017年第1期17-22,共6页

摘　　要：“铝热反应熔化法”可在316L奥氏体不锈钢中实现微米晶／纳米晶双峰晶粒尺度分布。通过室温单向拉伸试验研究，得到微纳结构316L不锈钢在800℃变形量为40％的条件下轧制开坯后，再降温在600℃下进行变形量为70％的轧制后，此时力学性能综合最佳。将其做为研究对象，使SEM联用原位拉伸台设备动态记录试样从加载到破坏的全过程。原位拉伸试验结果与单向拉伸载荷作用下的试验结果能较好吻合，原位拉伸试验对深入分析微纳结构不锈钢的力学性能和力学行为，总结归纳其蕴含的力学规律起到积极的促进作用。Nano-/microcrystalline 316L austenitic stainless steel with bimodal structure was prepared by aluminothermic reaction casting. Uniaxial tensile tests were carried out at the RT, and the results showed that the comprehensive properties were the best when rough rolling of nano-/microcrystalline 316L SS was done at 800℃ with a roiling deformation of 40%, and then reducing the temperature to 600~C with a rolling deformation of 70%. Samples of these materials provided dynamic recording of the entire process from initial loading to damage The results of in-situ tensile test were in observation, the mechanical properties and by SEM combined with in situ tension station equipment. reasonable agreement with uniaxial tensile test. In-situ mechanical behavior of nano-/microcrystalline stainless steel were analyzed, and the inherent mechanical laws of stainless steel were summarized.

关 键 词：纳米晶/微米晶不锈钢 原位拉伸 强度-塑性匹配 力学行为 

分 类 号：TG142.1[一般工业技术—材料科学与工程]