摘要课题组在分析国内外 ADS（次临界加速系统）候选马氏体耐热钢的成分、组 织和性能的基础上，自主开发具有耐高温、抗辐照和耐液态金属腐蚀性能的系列 SIMP 耐热钢，目前已获得了具有最优成分的 SIMP11 钢。为了研究 SIMP11 钢的最 佳热处理制度，利用正交实验设计了 25 组系列热处理工艺；并分析了各热处理状 态的 SIMP11 钢的显微组织、析出相，测试了其常规力学性能；用极差分析法分析 了各热处理参数（正火温度、回火温度、回火保温时间、回火冷速）对 SIMP11 钢 力学性能的影响，发现回火温度对强度、冲击韧性的影响程度都是最大；通过进 一步研究，定出了 SIMP11 钢最佳热处理制度：（1030～1100）℃正火 30min+（740～ 780）℃回火（90～120）min 后（油冷/空冷）。在此热处理窗口中，SIMP11 钢能 保持高的强韧性，同时冲击韧性可达 90-130J，达到了同类马氏体耐热钢水平。68575

毕业论文关键词 SIMP11 钢 显微组织 力学性能 热处理

Title The research of the microstructure and heat treatment for SIMP steels

Based on the analysis of the chemical composition,microstructure   and properties of Martensitic heat-resistant steels used in ADS（Accelerator Driven Sub-critical System）,our group developed SIMP steels to be high

resistant, and the SIMP11 steel of the most suitable chemical composition

has been designed.To develop the best heat treatment procedure for SIMP11,25 groups of heat treatment process were designed in the way of Orthogonal Experiment;The microstructure， precipitates and mechanical properties of SIMP11 were studied; The effects of all heat treatment parameters on the mechanical properties of SIMP11 were investigated in Range analysis ,and mechanical properties were mostly effected by temper temperature;Further studies were conducted,and to conclude,the best heat treatment procedure was (1030- 1100)℃ normalizing 30min +  (740 - 780)

℃ tempering (90 - 120) min +oil cooling / air-cooling，through which,high

strength and toughness were achieved, and impact toughness of SIMP11 was up to 90-130J,which are equal to other Martensitic heat-resistant steels.

Keywords SIMP11steel treatment

目次

1 绪论 1

1.1 核电的发展 1

1.2 ADS 候选材料马氏体耐热钢的性能要求 1

1.3 铁素体/马氏体耐热钢的发展 2

1.4 9-12%Cr 马氏体耐热钢的强化机制 5

1.5 9-12%Cr 马氏体耐热钢中各合金元素的作用 6

1.5.1 合金元素所具有的的共性作用 6

1.5.2 不同元素的特殊作用 6

1.5.2.1 提高抗氧化腐蚀性能的元素（Cr、Si） 6

1.5.2.2 固溶强化元素（W、Mo） 6

1.5.2.3 析出强化元素（C-N、V-Nb）