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hydrogen pickup

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
... from intergranular fracture ( Ref 6 ). Hydrogen from Preservice Pickling and Electroplating As noted, hydrogen stress cracking can occur from hydrogen pickup from manufacturing. Properly performed pickling alone is not usually a direct cause of hydrogen damage (unless internal voids or other...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
... is particularly pronounced as the yield strength is decreased ( Ref 5 ). Very low-impurity-content steels do show high threshold stress-intensity values and freedom from intergranular fracture ( Ref 6 ). Hydrogen from Preservice Pickling and Electroplating As noted, HSC can occur from hydrogen pickup from...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006283
EISBN: 978-1-62708-169-6
... hydrogen embrittlement mechanical properties quenching scaling solution heat treatment straightening stress-relief anneal titanium titanium alloys TITANIUM ALLOYS are classified into three groups with the following properties: Alpha alloys Non-heat-treatable for significant...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004148
EISBN: 978-1-62708-184-9
..., etc.). It does not impact the corrosion itself, but is involved in one by-product of the corrosion: The hydrogen pickup during corrosion leads to the precipitation of brittle hydrides upon cooling, the platelet orientations of which are controlled by this texture. Corrosion of Zirconium Alloys...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001463
EISBN: 978-1-62708-173-3
... the hydrogen content Selecting the welding parameters that minimize weld pool hydrogen pickup Designing the weld for minimum stress The use of ferritic-based weld deposits will cause the rejection of large amounts of hydrogen from the weld solidification. The hydrogen will go into the fully...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001440
EISBN: 978-1-62708-173-3
... the ratio of nitric acid to hydrofluoric acid at 10 to 1 strictly as a factor of safety. If the nitric acid content falls below 30 wt% and the ratio of nitric acid to hydrofluoric acid falls below 10 to 1, excessive hydrogen pickup is possible. Oxide Removal Lightly oxidized joint areas may also...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001432
EISBN: 978-1-62708-173-3
... where the use of excessive arc voltage and active fluxes results in high manganese and/or silicon pickup from the flux (see the section “Submerged Arc Welding” in this article). Fig. 1 Schematic showing location of hydrogen-induced cracks in carbon steel weldments. Source: Ref 1 Cracks...
Book Chapter

By Bruce Craig
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003634
EISBN: 978-1-62708-182-5
.... Shatter Cracks, Flakes, and Fisheyes Shatter cracks, flakes, and fisheyes are features common to hydrogen damage in forgings, weldments, and castings. They are attributed to hydrogen pickup during melting operations when the melt has a higher solubility for hydrogen than the solid alloy. During...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001311
EISBN: 978-1-62708-170-2
... toughens the scale and compounds descaling difficulties. An additional problem is that heat-treating furnace atmospheres are maintained on the oxidizing side to prevent hydrogen pickup. A layer of oxygen-rich metal ( Fig. 1 ) develops beneath the resulting scale formation, varying in thickness from 0.05...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005303
EISBN: 978-1-62708-187-0
... used in copper melt treatment are hygroscopic. Damp fluxes can therefore result in hydrogen pickup in the melt from the decomposition of water. External Components Furnace tools such as rakes, puddlers, skimmers, and shovels can deliver hydrogen to the melt if they are not kept clean. Oxides...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001409
EISBN: 978-1-62708-173-3
... of niobium and/or titanium to match the carbon, nitrogen, and oxygen contents (intermediate-purity Group III alloys). For these reasons, every precaution must be taken and welding procedures must be selected that optimize gas shielding and cleanliness to avoid pickup of carbon, nitrogen, oxygen, and hydrogen...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004000
EISBN: 978-1-62708-185-6
... alloying elements (including other metals and gases such as oxygen, nitrogen, and hydrogen) stabilizes either the α or β phase. The temperature at which a given titanium alloy transforms completely from α to β is termed the beta transus, β t , and is a critical temperature in titanium alloy forging process...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002170
EISBN: 978-1-62708-188-7
... affect beta phase, and thus can greatly affect hydrogen absorption. Etchant temperature and etch rate also affect the rate at which hydrogen is absorbed. Chemical milling process specifications normally specify either a maximum allowable final hydrogen content, or a maximum allowed hydrogen pickup...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003175
EISBN: 978-1-62708-199-3
... and damp melting tools, but the primary source of hydrogen is ambient humidity. Because little can be done to prevent hydrogen pickup during melting, hydrogen must be removed from the melt before pouring. The most common method used is bubbling dry nitrogen or argon through the melt. Rotary degassing units...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003823
EISBN: 978-1-62708-183-2
...-4 has more iron but no nickel for the purpose of minimizing hydrogen pickup. Both alloys are popular in water-moderated reactors, such as boiling water and pressurized water reactors. The Zr-2.5Nb alloy is used in heavy-water-moderated reactors, such as the Canadian deuterium-uranium reactors...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005201
EISBN: 978-1-62708-187-0
... … … … … Electrically inefficient; use when oxides are not permissible. 70F/30 70 30 … … … Difficult starting; high conductivity; use when aluminum is not allowed; risk of hydrogen pickup 70F/20/0/10 70 20 … 10 … Good general-purpose slags; medium resistivity 70F/15/0/15 70 15 … 15 … 50F/20...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003996
EISBN: 978-1-62708-185-6
... are susceptible to hydrogen pickup during reheating operations such that reheating equipment and practices are also critical elements of forging process control. Recommended preheating temperatures vary with alloy and are contained in Table 1 . Heating Equipment Aluminum alloys are heated for forging...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004114
EISBN: 978-1-62708-184-9
... Between differential temperature zones Between brine formations and relatively inert rock Between the well casing and the surface facilities if there is a metallic connection In addition, corrosive gases from a formation, such as carbon dioxide (CO 2 ) and hydrogen sulfide (H 2 S...
Book Chapter

By David V. Neff
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005353
EISBN: 978-1-62708-187-0
... are additional sources of hydrogen. Aluminum Degassing There are many means available to minimize hydrogen pickup or to degas a melt. Noting the increased solubility with temperature, as depicted in Fig. 1 , merely minimizing the melting or holding times and temperatures will lessen the hydrogen...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005345
EISBN: 978-1-62708-187-0
.... Postweld Heat Treatment (PWHT) The calculated CE value, potential for hydrogen pickup, and section thickness of the casting may dictate the need for postweld heat treatment to avoid or minimize the cracking potential. The need to perform this operation may be limited by the conditions under which...