David N. French

Since 1984, David N. French Metallurgists has served as a consulting firm providing metallurgical analysis, expert testimony and educational seminars, specializing in the power industry.

The Penthouse

All of our archived penthouse articles are now available. Click the links below to access each edition.

Summer 2020 - Effects of Chlorine and Cold Working on Stainless Steel Tubes

Fall 2018 - Secondary Combustion Issues

Fall 2017 - Carburization Corrosion of Stainless Steels and CSEFs

Winter 2017 - Effects of Load Cycling

Fall 2016 - Stress - Corrosion - Cracking

Winter 2015 - Understanding Fireside Corrosion

Fall 2014 - Strain-Induced Precipitation Hardening (SIPH)

Spring 2014 - A Closer Look at PRB Coal

Winter 2012 - Signs of Aging in Old Boilers

Summer 2011 - Issues Related to T-91/P-91 Steel

Fall 2009 - Under-Deposit Corrosion Issues in Boiler Tubes

Spring 2009 - Thermal Quench Cracking

Fall 2008 - Phosphate Corrosion

Summer 2008 - Cracking at Welded Attachments

Winter 2007 - Boiler Layup

Spring 2007 - Caustic Attack

Winter 2006 - Reducing Condition Corrosion

Spring 2006 - Waterside Deposits

Summer 2006 - Oil Ash Corrosion

Fall 2006 - Creep Fatigue

Winter 2005 - Creep & Remaining Life

Spring 2005 - Creep Failures

Fall 2005 - Fire-Side Problems in Super Heaters and Reheaters

Summer 2003 - Affects of Chlorine on Staineless Steels

Spring 2001 - Water Lance Damage

Winter 2000 - Superheater & Reheater Tube Materials

Winter 1999 - Scale Effects

Fall 1999 - Wall Thinning & Tube Failures

Winter 1998 - Cold Formed Austentic Stainless Steels

Spring 1998 - Some Metallurgical Problems with HRSGs

Winter 1997 - Dynamite Damage

Spring 1997 - The Low-Nox Burners

Summer 1997 - Steam-side Problems in SH & RH

Spring 1996 - Reheat Cracks

Summer 1996 - Corrosion Fatigue

Fall 1996 - Hydrogen Damage - Again

Winter 1995 - Thermal Fatigue

Fall 1995 - Waterwall Problems - Waterside

Winter 1993 - Fatigue, Thermal Fatigue, Corrosion Fatigue

Spring 1992 - Cold-Worked Carbon Steels

Summer 1992 - Stress Corrosion Cracking

Winter 1991 - Graphitization

Spring 1991 - Heat-Affected Zones

Winter 1990 - Stress Enhanced Corrosion

Spring 1990 - Unusual Corrosion Failures

Summer 1990 - Banded Microstructures

Spring 1989 - Waterside Deposits

Summer 1989 - Creep & Remaining Life

Fall 1989 - Dents & Dings

Winter 1988 - Grain Bioundaries

Spring 1988 - Heat-Treatment of Stainless Steels

Summer 1988 - Dew Point Corrosion

Fall 1988 - Equilibrium Microstructures

Winter 1987 - Creep Failures

Spring 1987 - Reducing Condition Corrosion

Summer 1987 - Some Design Thoughts

Fall 1987 - Erupment Failures

Winter 1986 - Hydrogen Damage

Spring 1986 - Oxygen Pitting

Summer 1986 - Bent Tubes

Fall 1986 - Stainless Steels

Winter 1985 - Dissimilar Metal Welds

Spring 1985 - Materials Upgrade

Fall 1985 - Tube Wastage/Wall Thinning

Spring 1984 - Thoughts on Superheater & Reheater Replacement

Summer 1984 - V.1, N.2

Fall 1984 - Fuel Ash Corrosion