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金属学报  2013, Vol. 29 Issue (4): 489-494    DOI: 10.3724/SP.J.1037.2012.00624
  论文 本期目录 | 过刊浏览 |
DD407单晶高温合金760℃屈服强度的LCP模型分析
张龙飞1,2),燕平1),赵京晨1),韩凤奎1),曾强1,2)
1) 钢铁研究总院高温材料研究所, 北京 100081
2) 钢铁研究总院高温合金新材料北京重点实验室, 北京 100081
ANALYZING THE YIELD STRENGTH OF SUPERALLOY SINGLE CRYSTAL DD407 AT 760℃ BY LCP-MODEL
ZHANG Longfei1, 2), YAN Ping1), ZHAO Jingchen1),HAN Fengkui1), ZENG Qiang1, 2)
1) High Temperature Materials Research Department, Central Iron and Steel Research Institute,Beijing 100081
2) Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081
全文: PDF(1204 KB)  
摘要: 

760℃下, 对22种不同晶体学取向的DD407单晶高温合金进行了拉伸断裂实验, 得到了产生0.2%塑性变形时对应的屈服强度. 使用SEM观察了各取向试样的断口形貌, 并使用XRD辨别了断口的晶体学特征. 结果表明, 靠近[111]取向的试样变形时启动立方滑移系, 而其它取向的试样均启动八面体滑移系. 使用LCP模型建立并分析了屈服强度与晶体取向的关系. 结果表明, 在760℃下, DD407单晶高温合金发生八面体滑移变形时, 屈服强度与晶体取向的关系符合LCP模型; 而沿[111]取向发生立方滑移变形时, 屈服强度与取向的关系偏离LCP模型. 基体γ相的参与变形导致LCP模型应用于γ/γ’双相的单晶高温合金时, LCP参数项b2为正.

关键词 单晶高温合金LCP模型屈服强度晶体取向    
Abstract

The yield strength, corresponding to 0.2% plastic deformation, of superalloy single crystal DD407 with 22 different orientations were measured at 760℃ to investigate the orientation dependence of yield strength for this superalloy. The facets of fractured specimens were observed by scanning electron microscopy and their crystallographic characters were identified with the aid of X-ray diffractometer. The results indicated that specimens near [111] were deformed by cubic slip systems,and the rests were deformed with octahedral slip systems. The orientation dependence of yield strength was established and analyzed by an LCP-model. It showed that the yield strength of DD407 specimens deformed by octahedral slip accorded with LCP-model, whereas those deformed by cubic slip, such as [111] crystals, deviated from LCP-model. A close inspection of the LCP parameters suggests that, in dual-phase γ/γ crystals, the effect of γ matrix must be responsible for the positive sign of b2 term which is negative in mono-phaseγ crystals.

Key wordssingle crystal superalloy    LCP-model    yield strength    crystallographic orientation
收稿日期: 2012-10-19     
通讯作者: 张龙飞     E-mail: zhanglf101@163.com
作者简介: 张龙飞, 男, 1985年生, 硕士

引用本文:

张龙飞,燕平,赵京晨,韩凤奎,曾强. DD407单晶高温合金760℃屈服强度的LCP模型分析[J]. 金属学报, 2013, 29(4): 489-494.
ZHANG Longfei, YAN Ping, ZHAO Jingchen, HAN Fengkui, ZENG Qiang. ANALYZING THE YIELD STRENGTH OF SUPERALLOY SINGLE CRYSTAL DD407 AT 760℃ BY LCP-MODEL. Acta Metall Sin, 2013, 29(4): 489-494.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00624      或      https://www.ams.org.cn/CN/Y2013/V29/I4/489

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