0Cr16Ni5Mo马氏体不锈钢δ-铁素体含量及奥氏体晶粒度的控制

doi:10.13251/j.issn.0254-6051.2022.09.034

摘要/Abstract

摘要： 检验中发现0Cr16Ni5Mo钢的δ-铁素体含量超出技术协议规定值,为降低δ-铁素体的含量同时控制奥氏体晶粒度以满足材料使用要求,通过理论计算和热力学模拟分析δ-铁素体形成原因,后续采用不同温度的淬火和高温扩散对0Cr16Ni5Mo钢组织和δ-铁素体含量变化进行对比研究,另外采用两种循环热处理方式对奥氏体晶粒度进行控制。结果表明,随着淬火温度的提高,0Cr16Ni5Mo钢的奥氏体晶粒度不断增大,而对δ-铁素体含量的减少作用相对有限。高温扩散能使δ-铁素体明显减少,但当扩散温度大于奥氏体向δ-铁素体转变温度时,会相对延缓铁素体的溶解。进行1130 ℃的高温扩散后,可以采用850 ℃和830 ℃的变温循环相变热处理,消除马氏体组织遗传,均匀细化奥氏体晶粒。

关键词: 0Cr16Ni5Mo钢, 显微组织, δ-铁素体, 热处理, 奥氏体晶粒度

Abstract: δ-ferrite content of 0Cr16Ni5Mo steel was found to exceed the value specified in the technical agreement. In order to reduce the content of δ-ferrite while control the austenite grain size to meet the service requirement, the causes of ferrite formation were analyzed through theoretical calculations and thermodynamic simulation, and the microstructure and change of δ-ferrite content of the 0Cr16Ni5Mo steel were investigated by means of quenching and high temperature diffusion treatment at different temperatures. In addition, two kinds of cyclic heat treatments were used to control the austenitic grain size. The test results show that with the increase of quenching temperature, the austenite grain size of the 0Cr16Ni5Mo steel increases continuously, but the reduction of δ-ferrite content is relatively limited. The high temperature diffusion can reduce the δ-ferrite content obviously, however, when the diffusion temperature is higher than the transformation temperature of austenite to δ-ferrite, the δ-ferrite dissolution is relatively delayed. After high temperature diffusion at 1130 ℃, a variable temperature cyclic phase transformation heat treatment at 850 ℃ and 830 ℃ can be used to eliminate the martensitic inheritance and uniformly refine the austenitic grains.

Key words: 0Cr16Ni5Mo steel, microstructure, δ-ferrite, heat treatment, austenite grain size

中图分类号:

TG161

田伟, 潘伟, 钟庆元. 0Cr16Ni5Mo马氏体不锈钢δ-铁素体含量及奥氏体晶粒度的控制[J]. 金属热处理, 2022, 47(9): 194-201.

Tian Wei, Pan Wei, Zhong Qingyuan. Control of δ-ferrite content and austenite grain size in 0Cr16Ni5Mo martensite stainless steel[J]. Heat Treatment of Metals, 2022, 47(9): 194-201.

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