• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>材料と環境 >Electrochemical Evaluation of the Degree of Temper Embrittlement with Mode Transfer in Impact Fracture Surface of 2.25 Cr-1 Mo Low Alloy Steels
【24h】

Electrochemical Evaluation of the Degree of Temper Embrittlement with Mode Transfer in Impact Fracture Surface of 2.25 Cr-1 Mo Low Alloy Steels

机译：2.25 Cr-1 Mo低合金钢冲击断裂表面回火脆化程度与模式转移的电化学评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

For the purpose of non-destructive evaluation of the degree of temper-embrittlement in 2.25wtpercentCr-lwtpercent Mo steels, anodic and single loop electrochemical potentiokinetic reactivation (SL-EPR) polarization curves of the embrittled specimens which had been serviced for oil refinery reactor for the maximum 25 years have been measured in 55wtpercent Ca(NO_3)_2 solution at 30deg C. The characteristic of electrochemical polarization is influenced by fracture appearance transition temperature shift (#DELTA# FATT) of Charpy impact test, P content and X-ray diffraction intensity ratio of M_(23)C_6/M_6C in temper-embrittled specimens. Difference in current density (I_(P2-E)-I_(pass-E)) between active second peak and passive in an anodic polarization curve of temper-embrittled specimens increases linearly with increase in #DELTA#FATT in the range of mode transfer over transgranular cleavage to intergranular of Charpy impact fracture. On the other hand, difference in current density (I_(PA-1E)-I_(pass-E)) between active first peak and passive in a SL-EPR polarization curve of largely temper-embrittled specimens turned up in region of #DELTA#FATT of above 69deg C, P content of above 0.01 wt percent and X-ray diffraction intensity ratio of M_(23)C_6/M_6C of above 1.38 in the range of intergranular mode of Charpy impact fracture. Therefore, it is possible to evaluate non-destructively the degree of temper-embrittlement in the range of mode transfer over transgranular cleavage to intergranular, in addition to judge transgranular or intergranular mode of Charpy impact fracture which indicate a criterion of intergranular bond deteriorate by measuring I_(P2-E)-I_(pass-E)and I_(PA-1E)-I_(pass-E) of temper-embrittled specimens.
机译：为了无损评估2.25wt％Cr-lwt％Mo钢中的回火程度，已为炼油厂反应堆提供服务的脆性样品的阳极和单环电化学电位动力学活化（SL-EPR）极化曲线在30％的55wt％Ca（NO_3）_2溶液中测量了最长25年的时间。夏比冲击试验的断裂外观转变温度变化（＃DELTA＃FATT），P含量和X射线衍射影响了电化学极化的特性。回火状试样中M_（23）C_6 / M_6C的强度比。在回火试样的阳极极化曲线中，有源第二峰值与无源电流峰值之间的电流密度（I_（P2-E）-I_（pass-E））之差随模式转移范围内＃DELTA＃FATT的增加而线性增加跨晶状卵裂至夏比冲击断裂的晶间。另一方面，在很大程度上回火的标本的SL-EPR极化曲线中，有源第一峰值和无源电流之间的电流密度（I_（PA-1E）-I_（pass-E））的差异在#DELTA区域内出现在夏比冲击断裂的晶界模式范围内，＃FATT在69℃以上，P含量在0.01wt％以上，M_（23）C_6 / M_6C的X射线衍射强度比在1.38以上。因此，除了判断通过夏普冲击断裂的跨晶或粒间模态（通过测量来确定晶间键变的判据）以外，还可以无损地评估在跨晶间裂变至晶间的模式转移范围内的回火程度。 I_（P2-E）-I_（pass-E）和I_（PA-1E）-I_（pass-E）的回火状试样。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号