液氮温度下奥氏体不锈钢强度试验研究  

Study on Strength of Austenitic Stainless Steel under Liquid- nitrogen Temperature

作　　者：郑津洋[1] 王珂[1] 黄泽[1] 缪存坚[1] 马利[1] 顾超华[1] 徐平[2] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]浙江大学力学系,浙江杭州310027

出　　处：《压力容器》2014年第8期1-6,24,共7页Pressure Vessel Technology

基　　金：中国博士后科学基金(2014M551731);浙江省重点科技创新团队项目(2010R50001);中央高校基本科研业务费专项资金(2014FZA4024)

摘　　要：为研究低温和预应变对奥氏体不锈钢强度的影响规律,以奥氏体不锈钢S30408为例,对母材和9%预应变材料进行了液氮温度下恒定速率的拉伸试验。研究表明:材料屈服强度和抗拉强度规律均符合正态分布;在95%可靠度和90%置信度的条件下,母材和9%预应变材料屈服强度的标准值分别为383 MPa和449 MPa,抗拉强度的标准值分别为1521 MPa和1535 MPa;低温能够显著提高材料的屈服强度和抗拉强度,而预应变能够有效提高材料的屈服强度,但对于抗拉强度基本没有影响;低温会降低材料屈强比,而预应变则会提高屈强比。To investigate the influence of low temperature and cold stretching on strength of austenitic stainless steel,the tensile tests were conducted under the liquid -nitrogen temperature with the parent metal and 9%-prestrained material of S30408.Results show that the distribution of yield strength and tensile strength can be described as normal distribution;Under the condition of 95%reliability and 90%confidence,the parent metal and 9%-prestrained metal′s standard values of yield strength are 383 MPa and 449 MPa respectively,and the standard values of ultimate tensile strength are 1521 MPa and 1535 MPa respectively;low temperature will increase yield strength and ultimate tensile strength dramatically, while the prestrain can only increase the yield strength;low temperature could decrease the yield ratio,yet cold stretching could increase it.

关 键 词：奥氏体不锈钢 液氮温度 拉伸试验 预应变 强度标准值 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG115.5[金属学及工艺—金属材料]