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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 elements on the microstructure and properties of the alloy, the alloy composition was adjusted on the basis of GMR235 alloy, and the alloy was vacuum smelted. The aluminum content (%, mass fraction) of 1 # ~ 5 # Al: 3.0%, 3.3%, 3.6%, 3.9% and 4.3%; the molybdenum content of 6 # ~ 10 # 11 # is the middle component without adding Zr, the 12 # sample is added with B and Zr as the middle component; the boron content of 13 # ~ 17 # sample is different, the design components are respectively 0.025%, 0.040%, 0.050%, 0.060 % And 0.070%. First, to observe the different Al, Mo, B, Zr content on the mechanical properties. Thermodynamic analysis was used to analyze the possible equilibrium phases of GMR235 alloy. The microstructure of the GMR235 alloy was observed by scanning electron microscopy. The specimens were subjected to tensile test at 650 ℃ and endurance test at 816 ℃ / 345 MPa. The results show that proper addition of Al, Mo and B can improve the mechanical properties of the alloy. The content of Al is 3.65% ~ 3.73%, the content of Mo is 4.92% and the content of B is 0.038%. Alloying elements B, Zr addition can significantly improve the alloy’s long life and plasticity, inhibition of carbide precipitation, the carbide particles refinement.