孙宪进,尚成嘉,苗丕峰,董丽丽

• 1:北京科技大学材料科学与工程学院
• 2:江阴兴澄特种钢铁有限公司

摘要(Abstract)：

研究了不同奥氏体化温度对690 MPa低碳低裂纹敏感性海工钢的奥氏体晶粒度、变体选择和韧脆转变温度的影响。结果表明:当奥氏体化温度大于930℃时,韧脆转变温度与奥氏体晶粒尺寸呈Cottrell-Petch关系,具体为:TB=-0.46-521.56d~(-1/2),原始奥氏体晶粒可代表有效晶粒;当奥氏体化温度为880℃时,原奥氏体内部的变体选择对大角度晶界密度有明显贡献,Block界面和Packet界面所影响的晶体结构单元(有效晶粒)与韧脆转变温度呈现对应关系。临界奥氏体化温度(880℃)明显地影响了相变组织的变体选择,提高了Block和Packet晶界密度,使得韧脆转变温度明显降低。

关键词(KeyWords)： 低裂纹敏感性海工钢;奥氏体化温度;有效晶粒尺寸;变体选择

Abstract:

Keywords:

基金项目(Foundation): 国家“973”项目(2010CB630801);; 国家自然科学基金(51371001)

作者(Author): 孙宪进,尚成嘉,苗丕峰,董丽丽

DOI: 10.13289/j.issn.1009-6264.2019-0292

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