Al与P对TRIP钢固态相变的影响  

Influence of aluminum and phosphorus on solid transformation of TRIP steels

作　　者：赵爱民[1] 张宇光[1] 赵征志[1] 张明明[1] 唐荻[1] 李本海[2] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]首钢技术研究院,北京100041

出　　处：《材料热处理学报》2011年第4期82-86,共5页Transactions of Materials and Heat Treatment

基　　金：国家"863"计划(2008AA03Z502);国家"十一五"科技支撑计划(2006BAE03A06);北京市科委重大项目(D07010300700701)

摘　　要：为了研究Al和P合金元素在TRIP钢固态相变过程中的作用,研究了4种不同合金成分C-Mn-Al-P TRIP钢的CCT图。结果表明,Al元素强烈的缩小奥氏体相区,提高Ac3与Ms。Al元素促使CCT图左移和上移。P元素能够阻碍碳化物的生成,当钢中P含量达到0.14%,能显著的将CCT图中的珠光体区与贝氏体区右移。P元素对铁素体相变和马氏体相变没有显著影响。利用类平衡下切变长大模型估算了4种TRIP钢的Bs点(A6钢为567℃,P1钢为556℃,P2钢为514℃,P3钢为548℃),与实际测量值吻合较好。研究表明在相同条件下,Al元素降低ΔμFγ→e,cαh,即增加相变驱动力,同时还降低ΔGmsh,eFaer,即降低切变阻力,提高Bs点。P元素增加ΔGmsh,eFaer,即增加切变阻力,降低Bs点。In order to study the effect of alloy element（Al and P） on solid phase transformation of transformation-induced plasticity（TRIP） steels,Continuous cooling transformation（CCT） diagrams and properties of four kinds of C-Mn-Al-P TRIP steels with different aluminum and phosphorus contents were examined by dilatometric test and microstructure observation using optical microscopy.Al made the formation of ferrite and pearlite shift to the left side,and the formation of bainite and martensite to higher temperatures on the CCT diagram as Al narrows the austenite phase region strongly and increases the Ac3 point and Ms point.P reduces kinetics of the cementite precipitation,and when its content reaches 0.14 wt%,it causes a shift of the forming temperature of pearlite and bainite to the right side on the CCT diagram significantly.No significant effect of P on ferrite and martensite transformation is observed.The Bs points of the investigated steels（A6,567 ℃;P1,556 ℃;P2,514 ℃;P3,548 ℃） are estimated using para-equilibrium shear growth model,which is in agreement with the experimental values.The results also indicate that Al increases the Bs point as it both reduces ΔμFγ→e,cαh（increases the driving force of phase transformation） and ΔGmsh,eFare（reduces the shear resistance）,and P decreases the Bs point as it increases ΔGsmh,eFaer.

关 键 词：相变诱发塑性 连续冷却转变 相变热力学 贝氏体 铝 

分 类 号：TG151[金属学及工艺—热处理]