氮强化高锰奥氏体钢热变形行为研究  

Deformation behavior of nitrogen strengthened high manganese austenitic steel

作　　者：逯允海[1] 付瑞东[1] 邱亮[1] 张静[1] 

机构地区：[1]燕山大学材料科学与工程学院,秦皇岛066004

出　　处：《材料热处理学报》2007年第2期69-72,101,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(59771001);河北省自然科学基金(E2004000197)

摘　　要：利用Gleeble-3500热力模拟试验机在温度为1253～1423K，应变速率为0．1～10s^-1的条件下对32Mn-7Cr-1Mo-0．3N奥氏体钢进行了热压缩变形试验，测定了其真应力-应变曲线，观察了变形后的组织。试验结果表明，流变应力和峰值应变随变形温度的降低和应变速率的提高而增大。真应变为0．6时，在1423K、应变速率在0．1～10s^-1之间的试样均已发生完全动态再结晶；在1373K以下变形时，应变速率在0．1～10s^-1之间，试样发生部分动态再结晶。动态再结晶晶粒尺寸随着变形温度的升高而增大，随着应变速率的升高而减小。32Mn-7Cr-1Mo-0．3N奥氏体钢的热变形激活能Q值为469．03kJ／mol，并获得热变形方程。The hot compressing deformation behavior of 32Mn-7Cr-1Mo-0.3N austenltic steel was investigated by using a Gleeble-3500 simulator at the temperatures of 1253 - 1423K and the strain rates of 0.1 - 10s^- 1 The compressing true stress vs true strain curves were measured and hot deformation microstructure were observed. The results indicate that the flow stress and peak strain increase with increasing strain rate or decreasing deformation temperature. When true strain is 0.6 and deformation temperature is 1423K, full dynamic recrystallization occurrs at the strain rates of 0.1 - 10s^- 1 When the deformation temperature bellows 1373K, dynamic recrystallization occurrs partially at the stain rates of 0.1 - 10s^- 1 . The dynamically recrystallized grain size increases with increasing deformation temperature and reduces with increasing strain rate.The hot deformation activation energy Q is 469.03kJ/mol and the hot deformation equation is derived based on the experiments.

关 键 词：高锰奥氏体钢 热变形 流变应力 动态再结晶 热变形激活能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]