激光退火对1Cr5Mo钢焊接接头热拉伸性能的影响

doi:10.11868/j.issn.1001-4381.2015.000720

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摘要

利用CO₂激光对1Cr5Mo耐热钢焊接接头进行退火处理，通过拉伸实验分析温度对激光退火前后试样热拉伸性能的影响。采用扫描电镜观察激光退火前后晶粒变化情况、断裂形式和断口形貌，并通过X射线应力仪测定激光退火前后焊接接头表面残余应力状态。结果表明：在200℃时激光退火后试样的屈服强度、抗拉强度和伸长率比原始试样分别提高了32.5%，22.5%和4.6%，而在300℃时激光退火后试样的屈服强度、抗拉强度和伸长率比原始试样仅分别提高了6.6%，6.5%和7.5%；激光退火前后试样拉伸断口均为韧性断口，但激光退火后试样的韧窝尺寸大于原始试样，随着温度升高，韧窝尺寸进一步增大；激光退火后试样表面产生的晶粒细化和残余压应力是热拉伸性能提高的主要因素。

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	郭卫
	孔德军

关键词 ：激光退火, 1Cr5Mo耐热钢, 焊接接头, 热拉伸实验

Abstract：

The 1Cr5Mo heat-resistant steel welded joint was annealed with CO₂ laser, the effect of temperature on hot-stretching properties of the samples before and after laser annealing was analyzed by using stretching tests. The grain changes, rupture modes and fracture morphologies before and after laser annealing were observed by SEM, and the status of residual stress on the surface of welded joints was measured by using X-ray stress analyzer. The results show that the yield strength, tensile strength and elongation rate of the samples after laser annealing at 200℃ increase by 32.5%, 22.5% and 4.6% than those of the original samples, respectively, while after laser annealing at 300℃, they only increase by 6.6%, 6.5% and 7.5%, respectively; the tensile fracture of the samples before and after laser annealing is tough fracture, but the dimple size of the samples after laser annealing is bigger than that of the original samples, with the increase of temperature, the dimple size increases further; the grain refinement and residual compressive stress generated on the surface of the samples after laser annealing are the main factors of hot-stretching properties improvement.

Key words： laser annealing 1Cr5Mo heat-resistant steel welded joint hot-stretching test

收稿日期: 2015-06-08 出版日期: 2018-02-01

中图分类号:	TN249
	TG115.5⁺2

基金资助:江苏省研究生科研创新计划项目(CXLX14-1098);江苏省科协首席专家（工程师）项目(2013-216)

通讯作者: 孔德军 E-mail: kong-dejun@163.com

作者简介: 孔德军(1966-), 男, 博士, 教授, 主要从事材料表面改性处理方面的研究, 联系地址:江苏省常州市常州大学机械工程学院(213164), E-mail: kong-dejun@163.com

引用本文:

郭卫, 孔德军. 激光退火对1Cr5Mo钢焊接接头热拉伸性能的影响[J]. 材料工程, 2018, 46(2): 115-121.
Wei GUO, De-jun KONG. Effect of Laser Annealing on Hot-stretching Properties of 1Cr5Mo Steel Welded Joints. Journal of Materials Engineering, 2018, 46(2): 115-121.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000720 或 http://jme.biam.ac.cn/CN/Y2018/V46/I2/115

Fig.1 焊接接头形状(a)与拉伸试样尺寸(b)

Fig.2 试样应力-应变拉伸曲线

Table 1 试样拉伸实验结果

Fig.3 200℃时原始试样拉伸断口形貌
(a)断口全貌; (b)纤维区; (c)放射区; (d)剪切唇区

Fig.4 200℃时激光退火后试样拉伸断口形貌
(a)宏观断口; (b)纤维区; (c)放射区; (d)剪切唇区

Fig.5 300℃时激光退火后试样拉伸断口形貌
(a)宏观断口; (b)纤维区; (c)放射区; (d)剪切唇区

Fig.6 断口分层断裂形貌
(a)200℃时原始试样; (b)200℃时激光退火的试样; (c)300℃时激光退火的试样

Fig.7 激光退火前(a)后(b)截面形貌

Fig.8 激光退火前(a)后(b)试样表面晶粒分布

Fig.9 激光退火前后试样表面XRD分析

Fig.10 激光退火前(a)后(b)试样表面残余应力

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