粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2014年
2期
177-183
,共7页
ODS-310合金%热变形行为%变形激活能%本构方程%热加工图
ODS-310閤金%熱變形行為%變形激活能%本構方程%熱加工圖
ODS-310합금%열변형행위%변형격활능%본구방정%열가공도
ODS-310 alloy%hot deformation behavior%deformation activation energy%constitutive equation%processing map
采用Gleeble-1500D热模拟试验机研究机械合金化制备的ODS-310合金在变形温度为1050~1150℃、应变速率为0.001~1 s-1条件下的高温变形行为，测定其真应力-应变曲线，分析其流变应力与应变速率及变形温度三者之间的关系，并采用Zener-Hollomon参数法建立ODS-310合金的高温变形本构方程，基于动态材料模型，构造 ODS-310合金的热加工图。结果表明：ODS-310合金的流变应力随变形温度降低或应变速率提高而增大；该合金热变形过程中的流变行为可用双曲线正弦模型来描述，在实验条件下的平均变形激活能为828.384 kJ/mol；真应变为0.4的热加工图表明，ODS-310合金在高温变形时存在2个加工失稳区，即变形温度为1050~1070℃、变形速率为0.01~1s-1的区域，和变形温度为1130~1150℃、变形速率为0.1~1 s-1的区域；ODS-310合金的最佳变形温度和应变速率分别为1150℃和0.001 s-1。
採用Gleeble-1500D熱模擬試驗機研究機械閤金化製備的ODS-310閤金在變形溫度為1050~1150℃、應變速率為0.001~1 s-1條件下的高溫變形行為，測定其真應力-應變麯線，分析其流變應力與應變速率及變形溫度三者之間的關繫，併採用Zener-Hollomon參數法建立ODS-310閤金的高溫變形本構方程，基于動態材料模型，構造 ODS-310閤金的熱加工圖。結果錶明：ODS-310閤金的流變應力隨變形溫度降低或應變速率提高而增大；該閤金熱變形過程中的流變行為可用雙麯線正絃模型來描述，在實驗條件下的平均變形激活能為828.384 kJ/mol；真應變為0.4的熱加工圖錶明，ODS-310閤金在高溫變形時存在2箇加工失穩區，即變形溫度為1050~1070℃、變形速率為0.01~1s-1的區域，和變形溫度為1130~1150℃、變形速率為0.1~1 s-1的區域；ODS-310閤金的最佳變形溫度和應變速率分彆為1150℃和0.001 s-1。
채용Gleeble-1500D열모의시험궤연구궤계합금화제비적ODS-310합금재변형온도위1050~1150℃、응변속솔위0.001~1 s-1조건하적고온변형행위，측정기진응력-응변곡선，분석기류변응력여응변속솔급변형온도삼자지간적관계，병채용Zener-Hollomon삼수법건립ODS-310합금적고온변형본구방정，기우동태재료모형，구조 ODS-310합금적열가공도。결과표명：ODS-310합금적류변응력수변형온도강저혹응변속솔제고이증대；해합금열변형과정중적류변행위가용쌍곡선정현모형래묘술，재실험조건하적평균변형격활능위828.384 kJ/mol；진응변위0.4적열가공도표명，ODS-310합금재고온변형시존재2개가공실은구，즉변형온도위1050~1070℃、변형속솔위0.01~1s-1적구역，화변형온도위1130~1150℃、변형속솔위0.1~1 s-1적구역；ODS-310합금적최가변형온도화응변속솔분별위1150℃화0.001 s-1。
Hot deformation behavior of ODS-310 alloy was investigated by conducting hot compression deformation tests on Gleeble-1500D simulator at the temperatures range of 1 050~1 150℃and the strain rate range of 0.001~1 s-1. True stress-true strain curves were obtained. The effects of strain rate and deformation temperature on flow stress were analyzed. The constitutive equation of the ODS-310 alloy at high temperatures was obtained by introducing Zener-Hollomom parameter. The processing map of ODS-310 was proposed on basis of dynamic materials model. The results show that the flow stress increases with the decrease of the deformation temperature and the increase of the strain rate. The flow behavior of ODS-310 alloy can be described by the hyperbolic sine model and the activation energy is about 828.384 kJ/mol. The processing map established at the true strain of 0.4 shows that there are two flow instability zones, including the zone at temperatures range of 1 050~1 070℃and strain rate range of 0.01~1s-1,and the other zone at temperatures range of 1 130~1 150 ℃ and strain rate range of 0.1~1 s-1. The optimal processing parameters are the temperature of 1 150 ℃ and strain rate of 0.001 s-1.
