MA Zheng-huan
,
ZHAO Xiang-juan
,
GE Chang-sheng
,
DING Tie-suo
,
LI Jun
,
XIAO Xue-shan
钢铁研究学报(英文版)
A new family of resource-saving, high chromium and manganese super duplex stainless steels (DSSs), with a composition in mass percent, % of Cr 0.29, Mn 0.12, Ni 2.0, Mo 1.0, and N 0.51-0.68, has been developed by examining the effect of N on the microstructure, mechanical properties and corrosion properties. The results show that these alloys have a balanced ferrite-austenite relation. The austenite volume fraction decreases with the solution treatment temperature, but it increases with an increase in N content. The increases in nitrogen enhance the ultimate tensile strength (UTS) and reduce the ductility of the material slightly. The pitting corrosion potential increases first and then decreases with an increase in nitrogen content when the amount of N arrives to 0.68%. The yield stress and ultimate tensile strength of solution-treated samples were more than 680 and 900 MPa, the elongation of experimental alloys are higher than 30%, respectively, what is more, the pitting potentials were beyond 1100 mV.
关键词:
duplex stainless steel
,
microstructure
,
mechanical property
,
pitting potential
王佳夫，王月香，花福安，李建平，王国栋
钢铁研究学报
在MMS-200热模拟试验机上，采用不同道次压缩法研究了00Cr22Ni5Mo3N双相不锈钢的高温热变形行为，从双道次压缩试验数据中得到不同温度条件下的软化率曲线，并对变形显微组织进行了分析。结果表明：在1~400s道次间隔时间内，软化率随时间延长而增加，在100s之内基本完成静态软化。变形温度越高，静态软化行为越明显，在950℃以下时，静态软化不明显；结合试验数据，求出00Cr22Ni5Mo3N 双相不锈钢的静态再结晶激活能Qrex=329kJ/mol；在总变形量0.9，变形温度1000℃的条件下，相对于2，3道次变形，单道次变形后组织中奥氏体含量要少。随着道次间隔时间的增加，奥氏体组织逐渐细化，相界曲线也由尖锐变得圆滑。
关键词:
双相不锈钢
,
hot deformation
,
static softening
,
microstructure
