张琰斌,刘林.一种含硼第三代镍基单晶高温合金的初熔及固溶处理研究[J].稀有金属材料与工程,2017,46(10):3105~3110.[zhang yan bin,liu lin.Investigation on incipient melting and solution heat treatement of a boron-bearing third generation single crystal nickel base superalloy[J].Rare Metal Materials and Engineering,2017,46(10):3105~3110.]
一种含硼第三代镍基单晶高温合金的初熔及固溶处理研究
投稿时间:2016-06-29  修订日期:2016-11-24
中文关键词:  高温合金  初熔  固溶处理  共晶
基金项目:国家自然科学基金(51171151);国家重点研发计划(2016YFB0701405); 国家自然科学基金(51331005)
中文摘要:
      采用电子探针测试结合Thermo-Calc软件计算,研究了一种含0.001 wt%硼第三代单晶高温合金枝晶间区域的初熔过程。结果表明,初熔相为M2B,初熔温度为1265 ℃,远低于用差示扫描量热仪测得的共晶熔化温度1352 ℃。采用扫描电镜分析固溶处理过程中合金组织的演化过程,发现共晶组织中马赛克状共晶和扇状共晶率先溶解,粗大γ′最后溶解。初熔区域空冷可发生均质形核,重新凝固后的共晶组织呈圆形,初熔组织中粗大γ′组织较初始凝固的粗大γ′组织更细,而相比残余共晶组织,初熔组织中含有马赛克状共晶和扇状共晶。在通用分步固溶处理制度的基础上,通过低于硼化物初熔的首步处理和适当提高最终固溶温度(ST2),可以有效避免初熔并完全消除共晶。
Investigation on incipient melting and solution heat treatement of a boron-bearing third generation single crystal nickel base superalloy
英文关键词:superalloy  Incipient melting  solution heat treatment  eutectic
英文摘要:
      The incipient melting process of a B bearing third generation single crystal superalloy was investigated by Thermol-Calc software. The simulation data was obtained by EPMA. The results show that the incipient melting phase was M2B and the incipient melting temperature was 1265 ℃, which is significantly lower than the melting temperature of eutectic (1352 ℃) obtained by DSC. The dissolution of γ/γ′ eutectics was studied by SEM. It was indicated that more time and higher temperature were necessary to dissolve the coarsen γ′ in eutectics than mosaic like eutectics and fan like eutectics. The sharp of incipient melting region was round. Homogenous nucleation could be found in incipient melting region due to the fast cooling rate of air cooling. The resolidification structure owned mosaic like eutectics and fan like eutectics which were dissolved in the early stage of solution heat treatment.
作者单位E-mail
张琰斌 西北工业大学凝固技术国家重点实验室 fice4628@163.com 
刘林 西北工业大学凝固技术国家重点实验室  
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