采用激冷斜槽法和低过热法进行浇注料坯的试验，在试验中研究了不同浇注温度和冷却板倾斜角度对所浇注料坯的微观组织的影响。
The experience was conducted using cooling slope and low superheat processes, effects of pouring temperature and the degree of slope on the billet's structure were researched.
结果表明，水龙头阀体开裂是由于存在过热造成的晶粒粗大、魏氏组织、铸造疏松等缺陷引起的脆性开裂。
The results show that the cracking of the tap valve is brittle crack, which is due to overheat to cause the formation of defects, such as coarse grains, Widmanstatten structure and porosity.
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.
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