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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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N对TWIP钢马氏体相变及力学性能的影响
DOI: 10.3724/SP.J.1037.2012.00047, PP. 769-774
Abstract:
以传统TWIP钢为对比,测试了含NTWIP钢的力学性能,并利用XRD进行物相分析和TEM进行微观结构表征.结果表明,在由fcc或hcp结构向bcc结构马氏体进行相变时,晶体结构中的最大间隙由0.1047nm降低至0.0725nm.间隙原子N的存在显著增大bcc结构的晶格畸变能,提高α马氏体切变的阻力,因而强烈抑制$\alpha$马氏体相变,导致组织中hcp结构ε相含量大幅度增加,提高了TWIP钢的强度,但也降低了钢的塑性.另外,奥氏体平均和区域层错几率的计算及微观组织分析结果表明,形变增加层错的数量,而马氏体相变消耗层错,从而减少层错数量.
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