碳含量对18Mn18Cr0.44N钢高温拉伸性能的影响  

Influence of Carbon Content on High Temperature Tensile Properties of 18Mn18Cr0.44N Steel

作　　者：房菲 易全伟 李静媛[2] FANG Fei;YI Quanwei;LI Jingyuan(Beijing Nuclear Chemical Research and Design Institute,China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国核电工程有限公司北京核化工研究设计院,北京100840 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《上海金属》2024年第4期60-64,共5页Shanghai Metals

基　　金：国家自然科学基金(51174026)。

摘　　要：采用Gleeble-1500热模拟试验机对含碳量(质量分数,下同)为0.025%和0.160%的18Mn18Cr0.44N钢进行高温拉伸试验,研究了不同温度(950~1250℃)下钢的断面收缩率和抗拉强度。结果表明:(1)碳含量影响18Mn18Cr0.44N钢的高温塑性,1号钢的断面收缩率随温度升高而升高,2号钢的断面收缩率随温度升高呈“V”形变化;2号钢在1025~1100℃温度范围内的塑性较低,断面收缩率仅为28%~33%,其原因主要是晶界残留的析出相脱落形成少量孔洞,孔洞在变形过程中成为裂纹,也可能是析出相固溶区域的元素偏析所致,应避免在该温度区间热加工,以防止零件开裂。(2)随着变形温度的升高,两种钢的抗拉强度均降低;当碳含量从0.025%增加至0.160%时,钢的抗拉强度随温度升高而增加的幅度减小。High temperature tensile tests were conducted on 18Mn18Cr0.44N steels with 0.025% and 0.160%C(mass fraction,the same below)by using a Gleeble-1500 thermal simulation testing machine,and the reduction of area and tensile strength of the steels at temperatures ranging from 950 to 1250℃were studied.The results were outlined as follows:(a)the carbon content affected the high temperature plasticity of 18Mn18Cr0.44N steel,with the increase in deformation temperature,the reduction of area of the steel No.1 increased,while the reduction of area of the steel No.2 changed in the V-shaped form;the plasticity of the steel No.2 was very low at temperatures of 1025 to 1100℃,it’s the reduction of area was only 28% to 33%,which was mainly caused by detachment of the residual precipitates from the grain boundaries,therefore a small number of pores formed and became crack during deformation,and may also be caused by the element segregation in the solid solution area of the precipitates,it is necessary that hot working in this temperature range is avoided to prevent the part from cracking;(b)with the increase in deformation temperature,the tensile strength of both steels decreased,and as the carbon content increased from 0.025% to 0.160%,the increment of tensile strength decreased with the increase in temperature.

关 键 词：18Mn18CrN 钢 碳含量 变形温度 高温塑性 抗拉强度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]