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金属学报  2013, Vol. 29 Issue (4): 421-427    DOI: 10.3724/SP.J.1037.2013.00002
  论文 本期目录 | 过刊浏览 |
B和P对GH984合金组织和力学性能的影响
肖旋1,赵海强1,2,王常帅2,郭永安2,郭建亭2,周兰章2
1) 沈阳理工大学材料科学与工程学院, 沈阳 110168
2) 中国科学院金属研究所, 沈阳 110016
EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GH984 ALLOY
XIAO Xuan1), ZHAO Haiqiang1,2), WANG Changshuai2), GUO Yongan2), GUO Jianting2),ZHOU Lanzhang2)
1) School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(5413 KB)  
摘要: 

利用真空冶炼制备了微合金化Ni-Fe基GH984合金并热锻、轧制成棒材, 采用OM, SEM和TEM观察了标准热处理后B和P微合金化GH984合金的微观组织, 并研究了B和P微合金化对合金力学性能的影响. 结果表明: B或P的微合金化对GH984合金中的析出相影响不大, 合金中的析出相为γ'相、Ti(C, N)相、MC型和M23C6型碳化物. 然而, B和P同时添加使M23C6型碳化物形貌由块状向粒状转变并均匀分布于晶界; B和P的添加对合金的室温和700℃拉伸强度无明显影响,但可成倍提高合金的高温拉伸塑性. 持久寿命随B和P的添加显著提高, 此外, 相对单独添加B, B和P的同时添加可以更好地改善合金的持久性能. 持久试样的断口观察表明, B和P微合金化明显改善了晶界强度, 断裂模式由沿晶断裂转变为混合断裂.

关键词 GH984抗热腐蚀高温合金B和P微合金化微观组织拉伸性能持久性能    
Abstract

The Ni-Fe based superalloy GH984 with microalloying is fabricated by vacuum induction furnace and hot worked by hot forging and rolling. The effect of B and P microalloying on microstructure and mechanical properties of GH984 alloy was investigated by OM, SEM and TEM after standard heat treatment. The experiment results showed that the addition of B and P has no obvious effects on the microstructure of GH984 alloy which has precipitates of sphericalγ', Ti(C, N), blocky MC as well as discrete M23C6 distributing along grain boundary. Moreover, the addition of B and P has no obvious influence on the tensile strength at room temperature and 700℃. However, tensile ductility increases greatly at 700 ℃ after B and P doping. It is worth to note that B and P microslloying can improve the stress rupture life of the alloy significantly. For example, the rupture life at the condition of 700 ℃ and 350 MPa increases from initial 115.03 h to 984.15 h. Investigation on the microstucture of the creep samples exhibites that B and P could effectively improve the strength of grain boundary and the fractural model from intergranular fracture to intergranular/transgranular mixed fracture.

Key wordsGH984    heat-resistant superalloy    B and P microalloy    microstructure    tensile property    creep strength
收稿日期: 2013-01-04     
基金资助:

国家高技术研究发展计划项目2012AA03A501和国家自然科学基金项目51172101资助

通讯作者: 周兰章     E-mail: lzz@imr.ac.cn
作者简介: 旋, 女, 1966年生, 副教授, 博士

引用本文:

肖旋,赵海强,王常帅,郭永安,郭建亭,周兰章. B和P对GH984合金组织和力学性能的影响[J]. 金属学报, 2013, 29(4): 421-427.
XIAO Xuan, ZHAO Haiqiang, WANG Changshuai, GUO Yongan, GUO Jianting, ZHOU Lanzhang. EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GH984 ALLOY. Acta Metall Sin, 2013, 29(4): 421-427.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00002      或      https://www.ams.org.cn/CN/Y2013/V29/I4/421

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