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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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800H合金热变形行为及热加工性能研究
DOI: 10.3724/SP.J.1037.2012.00740, PP. 811-821
Keywords: 800H合金,热变形,绝热温升,应变诱导析出,加工图
Abstract:
对800H合金进行单道次压缩热模拟实验,研究了该合金在850--—1100℃和0.01—30s-1条件下的热变形行为,建立了基于动态材料模型的热加工图,结合微观组织的演变规律,分析了工艺参数对800H合金热加工性能的影响.结果表明当应变速率超过1s-1时,800H合金在热变形过程中产生了明显的绝热温升现象,该现象随着变形温度的降低或应变速率的升高而更加明显;通过转动动态再结晶机制,在大应变速率下,剪切带附近产生了超细再结晶晶粒;当变形温度低于950℃时,在低应变速率条件下,应变诱导析出效应对晶界移动产生了具有钉扎效应的“齐纳压力'',增大了热变形激活能,抑制了动态再结晶的发生;利用加工图可以确定不同变形条件区域内的微观组织特征以及800H合金的最佳热加工工艺参数范围为975—1100℃和0.01—0.3s-1.
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