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OALib Journal期刊
ISSN: 2333-9721
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含钼复相不锈钢中X-相的形成
, PP. 89-105
Abstract:
17/5/6Cr-Ni-Mo不锈钢经1100℃水淬后含40％的δ-铁素体。高温保留下来的铁素体极为不稳定,加热至550°—1000℃在δ—铁素体内发生了一系列的变化。δ-铁素体分解产物的性质视加热温度而定,在700°—1000℃主要为X-相,在550°—700℃主要为Fe_3No_3C及(Cr,Fe,Mo)_(23)C_6。X-相形成的形态及其机构亦随加热温度而有所不同。在900°—1000℃δ-铁素体通过共析转变方式分解为X-相及奥氏体γ′δ-共析组织先在γ/δ,δ/δ相界成核然后逐渐向铁素体内部推进。在1000℃粒状的δ-共析组织居多,温度稍低则出现较多的层状组织。在700°—900℃X-相成核后,奥氏体γ′未能及时成核,因而当X-相的沉淀进行到一定阶段后,δ→γ′的转变才开始。在600℃保温观察到在奥氏体基体有马氏体的形成,这个现象可能与碳化物在低温的沉淀有关。
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