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首页> 外文期刊>Plasma and Fusion Research >Effect of HIP Temperature and Cooling Rate on Microstructure and Hardness of Joints for ODS-RAFM Steels and JLF-1 Steel
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Effect of HIP Temperature and Cooling Rate on Microstructure and Hardness of Joints for ODS-RAFM Steels and JLF-1 Steel

机译：HIP温度和冷却速率对ODS-RAFM钢和JLF-1钢接头组织和硬度的影响

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Dissimilar-metal joints between ODS-RAFM (oxide-dispersion-strengthened reduced activation ferritic/martensitic) steels and JLF-1 steel were fabricated by hot isostatic pressing (HIP) at 1000 - 1100 ?C with a cooling rate of 5 ?C/min. After the HIP, it was always quenched martensite for JLF-1 steel. However, coarse precipitates were found in 9Cr-ODS. Additional annealing experiments to simulate HIP conditions were conducted for 9Cr-ODS with cooling rate ranged from 0.5 to 36 ?C/min at 800 - 1100?C. The results showed that, to form quenched martensite for 9Cr-ODS, the HIP temperature should be above 1000 ?C with cooling rate no less than 25 ?C/min. When the cooling rate is increased to 36 ?C/min, the microstructure of 9Cr-ODS is quenched martensite with precipitate size similar as that before HIP. If the limitation of precipitate size in 9Cr-ODS is 0.2 μm, HIP temperature above 1050 ?C with cooling rate no less than 30 ?C/min is needed. In this case, post-weld heat treatment (PWHT) with only tempering is necessary to recover the microstructure of 9Cr-ODS to tempered martensite. For 12Cr-ODS, the HIP temperature and cooling rate has no effect on hardness and precipitate size. PWHT is not necessary for the single-metal joint of 12Cr-ODS from the view point of precipitation control. However, for the dissimilar-metal joints between ODS-RAFM steels and JLF-1 steel, the PWHT condition should be comprehensively determined by considering microstructural evolution of each part in the joints after HIP.
机译：ODS-RAFM（氧化物弥散强化还原活化铁素体/马氏体）钢与JLF-1钢之间的异种金属接头是通过在1000-1100 ？ C下以等静压热压（HIP）制成的。冷却速度为5 ？ C / min。在HIP之后，JLF-1钢始终使用马氏体淬火。但是，在9Cr-ODS中发现了粗大的沉淀物。对9Cr-ODS进行了额外的退火实验以模拟HIP条件，在800-1100 ？ C下，冷却速率为0.5至36 ？C / min。结果表明，为形成9Cr-ODS淬火马氏体，HIP温度应高于1000 ？ C，冷却速率不低于25 ？ C / min。当冷却速率提高到36 ？s / sup / min时，9Cr-ODS的显微组织是淬火的马氏体，其析出物尺寸与HIP之前的相似。如果9Cr-ODS中沉淀物大小的限制为0.2μm，则需要HIP温度高于1050 ？ C，且冷却速率不低于30 ？s / sup / min。在这种情况下，仅需回火的焊后热处理（PWHT）对于将9Cr-ODS的微观结构恢复到回火马氏体是必需的。对于12Cr-ODS，HIP温度和冷却速率对硬度和沉淀物尺寸没有影响。从降水控制的角度来看，对于12Cr-ODS的单金属接头，不需要PWHT。但是，对于ODS-RAFM钢与JLF-1钢之间的异种金属接头，应通过考虑HIP后接头中各部分的组织演变来综合确定PWHT条件。

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