S.Ravi
,
V.Balasubramanian
,
S.Nemat Nasser
材料科学技术（英文）
Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the availability of the ˉller material. In the present investigation, the fatigue crack growth behaviour of weld metal (WM) and heat affected zone (HAZ) regions of under matched (UM), equal matched (EM) and over matched (OM) joints has been studied. The base material used in this investigation is HSLA-80 steel of weldable grade. Shielded metal arc welding (SMAW) process has been used to fabricate the butt joints. Centre cracked tension (CCT) specimen has been used to evaluate the fatigue crack growth behaviour of the welded joints. Fatigue crack growth experiments have been conducted using servo hydraulic controlled fatigue testing machine at constant amplitude loading (R=0). A method has been proposed to predict the fatigue life of HSLA steel welds using fracture mechanics approach by incorporating influences of mismatch ratio (MMR) and notch location.
关键词:
Shielded metal arc welding
,
null
蔡晶琦
,
王悦
,
陈桂才
,
王礼良
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.06.020
介绍了关于铝合金板材的一种热冲压冷模具淬火复合成型工艺.该工艺在铝合金板材的成型过程中,同步完成铝合金板材的淬火,随后进行人工时效,极大地提高了铝合金板材的成型极限和强度.因此,成型件具有更轻的质量,更高的强度和更复杂的几何形状.最后讨论了使用该成型工艺的成型件在航天领域应用前景.通过对铝合金板材复合成型工艺和应用的介绍,可为我国铝合金板材成型工艺发展和工业化提供参考.
关键词:
铝合金
,
复合成型
,
高强度
