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。
Effects of 650℃ aging for 1-1000h on structure and hydrogenembrittlement 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 creates beside them during aging. The precipitates grow and connecteach other as the aging time prolongs, meanwhile, the degree of Cr-depletion aggra-vates first and then recovers gradually while the aging time is very long, i. e.,1000h. The HES of the steel increases with increasing aging time but dose notreduce with the recover of Cr content at the Cr-depletive region. That implies theexisting of carbides at grain boundaries might be the main reason which promotesthe HES of steel during aging.
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