刘建潮
,
郭蕴宜
,
邢中枢
,
师昌绪
,
梁武彪
金属学报
研究了650℃时效1—1000h对Cr21 Ni6Mn9N钢组织和氢脆敏感性的影响。结果表明,时效过程中,晶界上析出M_3C_6型碳化物,晶界附近出现贫Cr区。随时效时间的延长,碳化物变大并相互连接。晶界附近的贫Cr程度则随时效时间的延长逐渐加剧,但在100h以后又趋于恢复,当时效达1000h时恢复到与时效1—2h的试样相近。钢的氢脆敏感性随时效时间的增加而提高,并不因贫Cr现象的减轻而下降。这表明晶界碳化物的出现是时效过程中钢的氢脆敏感性提高的主要原因。
关键词:
时效
,
hydrogen embrittlement
,
M_(23)C_6
,
steel Cr21Ni6Mn9N
LIU Jianchao GUO Yunyi XING Zhongshu SHI Changxu Institute of Metal Research
,
Academia Sinica Shenyang
,
China LIANG Wubiao No.2 Automobile Factory
,
Shiyan
,
Hubei
,
China Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China
金属学报(英文版)
Effects of 650℃ aging for 1—1000 h on structure and hydrogen embrittlement susceptibility (HES)of steel Cr21Ni6Mn9N have been investigated.The results show that M_(23)C_6 type carbide precipitates at grain boundaries and Cr-depletive region appears beside them during aging.The precipitates grow and connect each other as the aging time prolongs.Meanwhile, the degree of Cr-depletion aggravates first and then recovers gradually while the aging time is very long,i.e.,1000 h.The HES of the steel increases with increasing aging time but does not reduce with the recovery of Cr content at the Cr-depletive region.That implies that the ex- isting of carbides at grain boundaries might be the main reason which promotes the HES of steel during aging.
关键词:
aging
,
null
,
null
,
null
LI Yuqing Research Institute of Daye Steel Works
,
Huangshi
,
China Senior Engineer
,
Research Institute of Daye Steel Works
,
Huangshi
,
Hubei Province 435001
,
China
金属学报(英文版)
The distinct images of intragranular VC were observed on TEM in superalloy GH36 underwent normal heat treatment and prolonged aging.The size of VC particles were meas- ured by means of Moire pattern,and the misfit between VC and austenite was also calculated. The M23C6 enveloped in VC shell was also observed in the prolonged-aged specimens.The coherent relation between intragranular M_(23)C_6 twins and austenite as well as its coherent in- terface were also studied.
关键词:
VC
,
null
,
null
,
null
