Al,Mo,B,Zr对GMR235合金组织和性能的影响  

Effect of Al,Mo,B and Zr on Microstructure and Mechanical Properties of GMR235 Alloy

作　　者：史世凤[1] 胡博炜[1] 贾崇林[1] 范强[1] 牛永吉[1] 

机构地区：[1]北京北冶功能材料有限公司,北京100192

出　　处：《稀有金属》2012年第1期48-53,共6页Chinese Journal of Rare Metals

摘　　要：为了研究微量元素对合金组织和性能的影响,在GMR235合金基础上对合金成分进行调整,合金采用真空冶炼,其中1#～5#试样铝含量(%,质量分数)不同,设计成分分别为Al:3.0%,3.3%,3.6%,3.9%和4.3%;6#～10#试样的含钼量不同,设计成分分别为:4.5%,4.8%,5.1%,5.6%和6.0%;11#为中间成分未添加Zr,12#试样为中间成分添加了B,Zr;13#～17#试样的含硼量不同,设计成分分别为:0.025%,0.040%,0.050%,0.060%和0.070%;首先,以观察不同的Al,Mo,B,Zr含量对力学性能的影响。用热力学计算分析GMR235合金可能析出的平衡相、用扫描电镜进行组织观察,对试样进行650℃拉伸试验、816℃/345 MPa持久试验。结果表明,适量的加入Al,Mo,B元素可提高合金的力学性能,Al含量3.65%～3.73%范围内、Mo含量4.92%左右、B含量0.038%左右的综合性能最好。合金元素B,Zr的添加可明显改善合金的持久寿命和塑性,抑制碳化物的析出,使碳化物颗粒细化。In order to study the effect of trace element on the microstructure and mechanical performance,the composition was adjusted on the base of GMR235 alloy,and the alloys were produced by vacuum melting.The contents（%,mass fraction） of different alloy elements were designed as follows： Al in No.1#～5# were 3.0%,3.3%,3.6%,3.9% and 4.3%;Mo in No.6#～10# were 3.0%,4.5%,4.8%,5.1%,5.6% and 6.0%;No.11# was intermediate composition without Zr addition;No.12# was intermediate composition with B and Zr addition;B in No.13#～17# were 0.025%,0.040%,0.050%,0.060% and 0.070%.Thermodynamic calculation was used to analyze the possible precipitation of equilibrium phases,and the microstructure was observed by scanning electronic microscope.The tensile test at 650 ℃ and endurance test at 816 ℃/345 MPa were carried on the samples.The experimental results showed that the proper addition of Al,Mo and B could improve the mechanical properties.The optimum content range of Al was 3.65% ～3.73 %,Mo～4.92% and B～0.038%.The addition of B and Zr could improve the high temperature creep rupture life and plasticity of the alloy distinctively,restraining the precipitation of carbides and refining carbide particles.

关 键 词：GMR235合金 微合金化 时效 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]