过热组织

结果表明，冲击功低者，其母材、热影响区和焊缝区分别存在较严重的带状组织、粗大的过热组织和夹杂物等。

The results showed that there was serious band structure in the base metal , overheated structure in heat affected zone and inclusion in welding seam .

研究结果表明：经S-S加工后油瓶壁和瓶底的显微组织相类似，均为晶粒较粗大、具有明显的β晶界、在晶内有片状二次α相析出，是一种过热组织。

The result showed that microstructures of oil tank wall and bottom had a similar shape by S-S processing ; the crystalline grain was coarse and it had β grain boundary , and second α phase was precipitated in intracrystalline .

结果表明，淬火加热温度偏高或加热时间过长，形成粗大的过热组织，即粗大针状马氏体和过热带状组织，导致后序磨削产生网状裂纹。

The cause of network cracks was analyzed . The results show that the overheated structures , that is , the coarse acicular martensite and overheated banded structures , because heating temperature is too high or holding time is too long , lead to network cracks after grinding .

采用普通熔铸法制备Al-Ti-B-RE中间合金细化剂，并就稀土元素、保温温度、过热温度对合金组织及细化效果的影响进行研究。

The influence of rare-earth and superheat temperature and holding temperature to refinement effect and master alloy Al-Ti-B-RE phase fabricated conventional casting were studied .

高速钢过热与过烧组织讨论

A Discussion on the Superheat and Overheat Microstructures of High-speed Steel

熔体过热处理是细化组织提高合金力学性能的有效途径。

Molten melt superheat treatment is an effective means for microstructure refinement and advancement of alloy mechanical property .

高温蠕变损伤是由于过热引起的，过热使金相组织内部产生蠕变空洞，在热应力下空洞扩展连接而形成蠕变裂纹。

Creep damage is mainly caused by superheat . Because of superheat , creep cavities are formed inside microstructure , under heat stress condition , growth and join of cavities induce creep cracking .