一种超高强度低合金钢的拉伸微屈服行为的原位中子衍射研究  

Study on Tensile Micro Yield Behaviour of an Ultra-high Strength Low Alloy Steel Studied Using In-situ Neutron Diffraction

作　　者：殷匠 徐平光 ZHANG S.Y. 

机构地区：[1]江苏亚星锚链股份有限公司,江苏靖江214533 [2]日本原子能机构 [3]卢瑟福实验室

出　　处：《热处理》2013年第6期5-9,共5页Heat Treatment

摘　　要：研究了一种超高强度低合金钢与环境裂纹敏感性(EAC)有关的拉伸微屈服行为。宏观屈服强度为1120 MPa,拉伸应力近700 MPa开始微屈服的超高强度低合金钢,其化学成分(质量分数,%)为0.22C-0.25Si-0.70Mn-3.40(Cr+Ni+Mo)-0.13(V+Nb+Ti)。用这种钢制作的深水系泊链环经1273 K淬火和873 K回火,原位中子衍射测量结果表明,对其光滑圆柱试样施加拉力,至应力500 MPa,良好地符合线弹性应变;至700 MPa时,(200)晶面族晶粒优先出现非线弹性应变;至800 MPa,(110)晶面族晶粒也呈非线弹性应变。随着拉力的进一步增大,(200)晶面族晶粒的非线性弹性应变量逐步增加,而(211)晶面族晶粒仍停留在线弹性应变阶段。Micro yield behavior connected with environment assisted cracking（EAC） for an ultra-high strength low alloy steel was investigated. The chemical composition of ultra-high strength low alloy steel, which has macro yield strength of 1120 MPa and exhibits micro yield when tensile stress is near 700 MPa, is 0.22C-0.25Si -0.70Mn-3.40（Cr ＋ Ni ＋ Mo）-0. 13 （V ＋ Nb ＋ Ti） （mass fraction,% ）. In-situ neutron diffraction results show, as the smooth cylinder specimens taken from deepwater mooring chain made of above-named steel and quenched from 1273 K and tempered at 873 K is subjected to tension stresses, that the specimen offers a good linear elastic deformation when subjected to the stress up to 500 MPa, and the grains of （200） family of crystal planes exhibit a non-linear elastic strain over all others when subjected to the stress up to 700 MPa , as well as the the grains of （110） family of crystal planes also offer a non-linear elastic strain when subjected to the stress up to 800 MPa. As the tension stress become greater, the non-linear elastic strain amount of the grain of （200） family of crystal planes will increase progressively, but yet the grains of （211） family of crystal planes are still in the linear elastic deformation stage.

关 键 词：R5海洋系泊链 超高强度钢 中子衍射 微屈服 晶格应变 

分 类 号：TG142.41[一般工业技术—材料科学与工程]