热处理
熱處理
열처리
HEAT TREATMENT
2013年
6期
5-9
,共5页
殷匠%徐平光%ZHANG S.Y.
慇匠%徐平光%ZHANG S.Y.
은장%서평광%ZHANG S.Y.
R5海洋系泊链%超高强度钢%中子衍射%微屈服%晶格应变
R5海洋繫泊鏈%超高彊度鋼%中子衍射%微屈服%晶格應變
R5해양계박련%초고강도강%중자연사%미굴복%정격응변
R5 offshore mooring chain%ultra-high strength low alloy steel%neutron diffraction%micro yield%lattice strain
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。
研究瞭一種超高彊度低閤金鋼與環境裂紋敏感性（ EAC）有關的拉伸微屈服行為。宏觀屈服彊度為1120 MPa，拉伸應力近700 MPa開始微屈服的超高彊度低閤金鋼，其化學成分（質量分數，％）為0．22C-0．25Si -0．70Mn-3．40（Cr＋Ni＋Mo）-0．13（V＋Nb＋Ti）。用這種鋼製作的深水繫泊鏈環經1273 K 淬火和873 K迴火，原位中子衍射測量結果錶明，對其光滑圓柱試樣施加拉力，至應力500 MPa，良好地符閤線彈性應變；至700 MPa時，（200）晶麵族晶粒優先齣現非線彈性應變；至800 MPa，（110）晶麵族晶粒也呈非線彈性應變。隨著拉力的進一步增大，（200）晶麵族晶粒的非線性彈性應變量逐步增加，而（211）晶麵族晶粒仍停留在線彈性應變階段。
연구료일충초고강도저합금강여배경렬문민감성（ EAC）유관적랍신미굴복행위。굉관굴복강도위1120 MPa，랍신응력근700 MPa개시미굴복적초고강도저합금강，기화학성분（질량분수，％）위0．22C-0．25Si -0．70Mn-3．40（Cr＋Ni＋Mo）-0．13（V＋Nb＋Ti）。용저충강제작적심수계박련배경1273 K 쉬화화873 K회화，원위중자연사측량결과표명，대기광활원주시양시가랍력，지응력500 MPa，량호지부합선탄성응변；지700 MPa시，（200）정면족정립우선출현비선탄성응변；지800 MPa，（110）정면족정립야정비선탄성응변。수착랍력적진일보증대，（200）정면족정립적비선성탄성응변량축보증가，이（211）정면족정립잉정류재선탄성응변계단。
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 .
